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We are a global media agency with a difference

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Seeing the Bigger Picture means that our network of 8,000 people help our clients look beyond the boundaries of traditional media to uncover new ideas and unlock growth. We challenge conventional thinking to build, optimise and drive our clients’ businesses forward at scale, as well as leading our industry in critical areas such as equity, inclusion and sustainability.

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Collaboration with our WPP and GroupM networks, as well as our clients’ agency partners, is key. This gives us access to the richest data sets and expertise in the world, allowing us to work in increasingly agile ways to provide a full scope of robust and innovative solutions to deliver exceptional results.

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We’ve invested in People First, Better Results for over two decades – it’s the lifeblood of our agency with equity and inclusion at its core. It means going above and beyond to provide full person wellbeing and career growth for everyone – allowing our talent to maximise their potential both personally and professionally.

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Everything we do is underpinned by our award-winning digital and technology capabilities. Our world-first planning platform, The System, unites our people giving us the ability to provide consistent, data-led solutions for every client. We harness our deep relationships with technology partners to create campaigns that deliver unrivalled results.

How we do it

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Bringing together media and creative to drive brand relevance and growth

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Harnessing technology and talent to unleash growth through digital transformation

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Data and technology experts delivering transformative products and services

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Nick Lawson – Global CEO

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Nick embodies MediaCom’s People First, Better Results philosophy, having been with the agency for 30 years. He started as a Planning Assistant in 1991 and today leads our network of more than 7,500 people across 125 offices as Global CEO. He has been in leadership positions since 2006, having previously been UK CEO, EMEA CEO and Worldwide COO.

During his tenure, he drove MediaCom UK’s ranking from 6th to 1st position, oversaw MediaCom becoming the number 1 network in EMEA and most recently led the agency to be crowned Media Network of the Year by Festival of Media Global and Eurobest for 2020.

Nick believes that by helping clients See The Bigger Picture, we can understand the full breadth of their marketing needs and tailor communications strategies to maximise impact.

Josh Krichefski – Global COO & EMEA CEO

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Josh has been at MediaCom for more than a decade in a variety of leadership positions at Global, Regional and Local levels. He is currently both our Global COO and CEO EMEA, where he is responsible for 4,400 people across 37 offices, driving the vision and culture in EMEA and ensuring that MediaCom is the strongest agency network in the region.

Previously Josh was MediaCom’s UK CEO, the country’s No.1 media agency billing over £1.8bn across 6 offices. He has not only worked in media agencies but on the creative agency side too, working at St. Luke’s in the early 2000s and he also ran his own digital agency, Kword.

Josh is also the driving force behind our mental health programme, resulting in a network Mental Health Allies around the world who support our people whenever they need.

Sasha Savic – CEO, US


Since joining MediaCom as U.S. CEO in 2012, Sasha Savic has delivered nine years of growth, bringing unprecedented success and recognition, resulting in MediaCom winning Adweek’s 2021 Global Media Agency of the Year, and Sasha himself recognized as Adweek’s 2021 U.S. Executive of the Year.

In 2019, Savic lead the charge in the formation of the New Majority Ready™ (NMR) Coalition – a movement to help brands engage with multicultural audiences and place diversity in the forefront of their strategies in context of the New Majority in America.

He is also a sought-after speaker – most recently on stage at CES and Advertising Week New York, as well as serving on the jury for Cannes Lions International Festival of Creativity, the Effie Awards and Brand Film Festival and was Jury Chairman for Adweek's Media Plan of the Year for several years. He is also a member of the 4As Media Leadership Council and actively supports environmental causes and sustainability through participation in NASF and ASF in North America.

A native of Bosnia, Sasha began his career as a founding member and producer of YouthRadio, the first independent radio station in the former Yugoslavia.

Marina Günther Guzman – CEO, LATAM

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Marina joined MediaCom as CEO MediaCom Latam in January 2021.

With almost 30 years of experience, Marina has worked in advertising at many companies. During her tenure overseeing many accounts, she has received several awards including 4 Effies and the Latin America Excellence Award 2016.

In 2012 she became General Director of Havas Media Regions and oversaw the opening of 6 regional offices in Mexico. In 2014, Marina became Havas Middle Office Director, and in 2016 she was promoted as CEO of Arena. She was also a member of the Board of Havas Mexico since 2014.

She started working at GroupM in May 2017, as the General Director of Operation and Head of Trade for Mexico, leading the BetMex Project. In November 2019, she became CEO GroupM México.

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Marina is married with two children and loves to spend time with her family. She is a huge fan of the NFL's Greenbay Packers, and also really enjoys solving puzzles.

Rupert McPetrie – Chief Executive Officer, APAC and Greater China

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Rupert started his media career in London at Zenith, and over the last 20+ years has moved progressively East through Eastern Europe and Russia, entering the APAC region by moving to Shanghai in 2015 to lead MediaCom China. Over the past 7 years, he has led the development of the agency in the fast-moving media world in China, creating new models, building new capabilities, and growing the teams and the business over the last years, with the agency moving progressively up the agency rankings. Since 2022, Rupert heads up the APAC region as well as Greater China and he is a valued leader on the Global Executive Committee.

Originally a media buyer, he is a passionate believer in People First Better Results, taking great pride in building and nurturing high performance and diverse teams across APAC’s 15 markets.

Claire Camara – Global Chief People Officer

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Claire Camara joined the agency as Global Chief People Officer in November 2021. Her core aim is simple: to ensure that MediaCom continues to live and role model its People First Better Results ethos, by unlocking our incredible potential, providing great careers for our people as well as supporting all MediaCommers to play their part in delivery on our business strategy.

Claire has held a number of international roles at a wide range of organisations, ranging from the London 2012 Olympic and Paralympic Games to Baku 2015 as well has holding senior leadership positions at companies including Marks & Spencer, Superdrug and the Princes Youth Business Trust. Most recently, she has been Director for Organisational Effectiveness and Director of Executive Talent, Resourcing & Diversity at the Co-op.

Her experience, knowledge and commitment to developing great leaders and delivering inclusive workplaces will ensure MediaCom learn from other well-respected organisations and make the network an even more attractive destination for the best talent inside and outside of our industry.

Charlotte Frijns – Global Chief Financial Officer

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Charlotte oversees MediaCom’s financial and commercial operations globally.

Having joined MediaCom in January 2021, Charlotte is responsible for a wide range of functions within the business – from managing financial information, commercials to contract compliance and client negotiations. Charlotte adds financial insight to the way MediaCom manages current operations and new services aimed to add value to clients. She joins from GroupM UK, where she was CFO for 2.5 years allowing her to bring huge experience of handling the financial side of agency life.

She brings a wealth of experience from her early days at PwC transaction services followed by a range of senior finance and commercial roles within agencies such as Zenith, Digitas and more recently Publicis Media. She lives with her 9 year old twins and Australian husband in London, since relocating here in 2005 from the Netherlands.

Matt Mee – Global Chief Strategy Officer

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Matthew is MediaCom’s Global Chief Strategy Officer. In the course of his career at MediaCom he has advised a huge range of UK-based and Global clients; including Mars, Universal, IKEA Bayer and Adidas. He is the originator of MediaCom’s planning approach, Systems Planning and led the creation of The System; MediaCom’s global end to end planning platform.

His passion and commitment to innovation and integrated thinking continue to shape MediaCom’s expanding capabilities; from data-driven planning to more effective collaboration.

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Stef Calcraft – Global CEO, Creative Transformation

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Stef Calcraft is MediaCom’s CEO, Creative Systems. His role is to help MediaCom deliver Bigger Picture thinking for our clients and agency partners by harnessing the full potential of our world-class talent, data, technology, media and platform relationships.

Stef is the co-founder of Mother, one of advertising’s most iconic agencies. Mother was recognised as one of the greatest agencies of all time in Campaign Magazine’s 50th Anniversary issue. While at Mother, Stef was also a silent founding partner of Naked Communications, a trail-blazing communications planning agency in the 2000s. Stef has also served as Non-Executive Director for Blue Rubicon, now part of Global CEO Advisory Firm Teneo and as an adviser to Ridley Scott and Disney’s Maker Studios. Before joining MediaCom, Stef was Executive Chairman of Dentsu International UK & I. Stef began his career in marketing at Unilever.

Paddy Flynn – Global Leader, Systems Intelligence

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Paddy leads MediaCom’s Systems Intelligence Unit. The SIU has over 300 experts globally, providing advanced data, analytics, research, & measurement capabilities for MediaCom’s clients. Paddy joined MediaCom in 2011 within our Singapore hub and has gone on to lead several ground-breaking data & mar-tech teams across MediaCom & GroupM.

Prior to joining MediaCom, Paddy held consultancy roles with a major global marketing analytics firm; and economic research roles with a leading European research institute under the current ECB Chief Economist. This background enables Paddy to combine deep subject matter expertise with bigger picture experience.

Paddy is passionate about providing MediaCom’s clients with a data & intelligence advantage to win & grown in the real world. The SIU achieves this through excellence in not just data access and analysis, but in also ensuring excellence in media application & organizational adoption.

If you are interested in knowing more about the SIU and our work, please don’t hesitate to get in touch.

Felicity Long – Managing Director, Systems Acceleration

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A true digital native, having spent her entire agency career in a digital roles – Fliss focuses on helping our clients navigate this fast-paced, ever-evolving area of marketing by simplifying, but not over-simplifying, the complex and helping clients be first-to-market with the most valuable interactions with their consumers.

Throughout her career she has held various leadership roles, and current role sees her responsible for delivering world-class addressable activation and cross channel acceleration for MediaCom clients across the globe. She has a real passion for using technology to free up time to ensure that as much of MediaCom’s amazing talent is focused on finding that insight and collaborating in new and different ways that will really make a difference to our clients businesses.

Fliss is also a passionate mentor both in and out of MediaCom and loves to see people’s careers develop and flourish.

Nick Slaymaker – Global Chief Investment Officer

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As our Global Chief Investment Officer at MediaCom, Nick’s core focus is creating accountable and sustainable media value for our clients at this time of rapid change in media. His role also sees him leading MediaCom’s global partner relationships and managing investment product development. Nick joined MediaCom in 2011, having been part of the GroupM family since 2005 and sits on the Global GM trading board.

Vincent Rebeix – Global Chief Product Officer


A 13 years veteran of MediaCom, Vincent has held various leadership positions at a global, regional and local level including most recently Global Head of New Business and Marketing, and COO for MediaCom France.

As Chief Product Officer, Vincent spends his time working to provide our clients with the most effective solutions to their marketing challenges. From building measurement stacks to defining new ways to address audiences at scale, he seeks to bring empirical, technology-driven answers to some of the industry’s oldest “Bigger Picture” questions: How do I create closer bonds with consumers? Does my marketing actually work?

In addition to his product duties, Vincent is also executive sponsor for MediaCom’s marketing team.

Nadine Thomson – Global Chief Technology Officer and Blink Consultancy Lead

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Nadine Thomson is the Global Chief Technology Officer and Executive Lead for Blink. Blink is the successful global MediaCom consultancy delivering specialist services to clients across ecommerce, advertising and marketing technology, media innovation and in-housing. We use our deep specialist knowledge and a network of our media consultants across the globe to deliver transformational solutions for clients.

Nadine also leads the MediaCom technology strategy delivering our award-winning technology capabilities and products for our clients and staff. Over her career, Nadine has led B2B and B2C international transformation programmes across media, retail, travel, entertainment, insurance and professional services. Alongside her role at MediaCom, Nadine is on the Board of VisitEngland the national tourism agency raising Britain’s profile worldwide and developing England and Britain’s visitor economy.

Michelle Holmes – Co-Chair, Global Belonging Council, Global Account Director

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Michelle Holmes, a Managing Partner at Mediacom, is an experienced advertising and marketing professional with deep expertise in digital, CRM and data-driven omni-channel strategy. She manages a portfolio of global accounts and is the co-chair of the global belonging council.

Michelle started her career path on the brand side at fortune 50 companies such as Allstate Insurance Company and Walgreens, eventually leading to senior level consulting and agency roles. Prior to joining MediaCom, Michelle held several leadership roles at Accenture and Merkle Inc. working with clients such as Walt Disney World, Marriott, Royal Caribbean, USAA, Samsung and DirectTV.

Michelle has won several marketing and advertising awards for excellence in strategy and digital and was most recently named a 2021 Media Allstar by Adweek.

Costin Mihaila – Global Client President

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Costin is a MediaCom veteran having joined the agency in 2007. After various roles with Initiative (IPG) and The Coca-Cola Company in his native Romania and later in The Netherlands, Costin joined MediaCom in Amsterdam as EMEA Client Service Director working on Mars and P&G. He was then promoted to run the CEE region as CEO.

In 2014, he moved to London to start his role of EMEA Managing Director, in addition to which he had direct responsibility for several global client relationships at MediaCom. From September 2019 he is solely focused on global clients. In addition to direct client responsibilities, Costin sits on MediaCom’s product board to represent the voice of clients in the development process of tools and approaches. He also leads the client satisfaction measurement and client management training workstreams in the agency.

Frances Ralston-Good – Global Client President

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Frances has spent the last 25 years developing resilient teams, relevant products and effective business practices for the world’s most innovative creative and media businesses. She has extensive experience across the FMCG, retail and motor sectors, having worked with brands that include, Amazon, BMW and Mondelez and has led media, creative and brand strategy businesses in both the northern and southern hemisphere.

Frances joins MediaCom from Hearts & Science where she launched the agency as CEO in the UK following stints as MD of PHD in same market and Chief Innovation Officer for OMGUK. At MediaCom Frances is Global Clients President, ensuring Bigger Picture is brought to every client she works with and is lucky enough to lead our relationship with P&G, Sony and Shell amongst others.

Ian Rotherham – Global Chief Growth Officer

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Across 25 years of media & communications experience, Ian has assumed responsibility for leading some of the world's largest blue-chip advertising assignments. Starting in 1996, Ian’s career has seen him lead UK, European and Global units across the media, sponsorship and events industries.

Upon joining MediaCom in 2011, Ian has led teams of 1,000+ people supporting clients with their business and marketing transformation programmes. These programmes are less about what we have achieved, and more about what our clients have achieved as a result; made better-informed marketing decisions, more effective campaign work, measured what really matters, and realise this more efficiently. The impact has been dramatic with some of our strongest media contribution to sales & brand growth, as well as client satisfaction scores worldwide.

Ian’s outcomes-based mindset and multi-discipline background led to him being confirmed as WPP's first team lead from a media background.

Simon Sadie – Global Client President

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Simon has been a part of the MediaCom family for nearly a decade, helping to build our global success stories as Global Client President. He currently leads our $1.5bn billing strategic partnership with Mars. Simon has had a varied career, defined by building high-functioning teams in fast-changing, competitive situations.

Prior to joining MediaCom, Simon established a strategy and innovation consultancy, babytiger. Previously he held senior management roles at Aegis Media (now Dentsu), where he was a founder of their second agency network, Vizeum, and at Havas.

In the late 1990s, Simon helped establish and ran a digital agency, Media Contacts (now part of Havas Media), prior to which he was a founding manager of the BBC’s nascent online proposition, BBC Online.

Simon has experience working with clients from many different sectors, including PSA, Hyundai-Kia, Pernod-Ricard, Cadbury’s, 20th Century Fox, Philips, Panasonic, Benckiser and more.

Beyond work, Simon is a trained “Three Principles” practitioner, focused on helping people to understand how ‘state of mind’ impacts their ability to operate to their true potential and is also Chair of the campaigning NGO, Yachad, which works to support a negotiated settlement to the Israeli-Palestinian conflict.

Justin White – Global Client President


Justin has over 20 years of agency experience, with over 15 years in regional or global roles. He has held a range of executive roles covering client leadership, new business and global operations. Justin is also a digital agency founder and entrepreneur. He has led teams that worked with some of the world’s most dynamic and recognisable brands including Coca Cola, Heineken, McDonald’s, Cisco, SAP, Lenovo, BlackBerry, British Airways, ASICS and others.

Most recently before joining MediaCom, Justin was the Global Client Lead for The Coca Cola Company as well as the Head of Business Intelligence and Client Performance for Publicis Groupe. Prior, he led the Publicis Media Global Client Practice after being co-lead for Global New Business at Starcom Mediavest Group.

Justin is based in the United States, where he lives with his Canadian wife and two boys.

Kristin Gower – Global Client President

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With a background in Organisational Psychology, Kristin has led Marketing and Client teams in Europe, North America and Asia, becoming an expert not only in relocation services, but the importance of continual learning, humility and resilience. Before joining MediaCom in 2012, Kristin spent 11 years at Dyson, starting in the UK, then moving to set up marketing and eCommerce operations in Canada and China. Kristin’s leadership in creative/media integration, unified data architecture, and eCommerce has delivered innovation and growth for a broad roster of clients, including P&G, Fonterra, and Dell.

Kristin is Global Client President in the WorldWide Hub, New York. In this role, she leverages her understanding of the complexity of multi-national marketing and business to ensure the success of our clients US head-quartered Global clients.

Paul Greenhalgh – Global Chief Commercial Officer

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Paul ensures that success and best practice in each market is transmitted right across the network. He joined MediaCom as Global Commercial Director in January 2010, after nearly 20 years at Aegis Media Latin America, overseeing operations in Brazil, Argentina and Mexico as well as managing the network’s affiliate/partner networks.

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