We are specialists.

Together, let’s unlock the full potential of marketing technology.

Brandon Starkoff

CEO, Managing Partner

Brandon specializes in helping brands unlock greater customer value by connecting their technology, data and processes. He spent 16 years at Publicis’ Starcom MediaVest Group where he lead integrated media planning and buying for major global brands such as Sun Microsystems, BlackBerry and Sprint. He was also a key leader in the Agency’s transformation towards advanced digital and mobile activation, including early testing in addressable platforms. Most recently he was VP Head of Industry at xAd, an industry leading mobile location platform where he integrated one-to-one real-time audience insights into mobile targeting to deliver positive ROI for large scale Brands.

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Stephanie Ridley

Partner, Accounts

Stephanie is a founding member of Transparent Media Partners and leads its digital enablement consulting practice. She has led data enablement, communications planning and media buying for leading brands that include Procter & Gamble, BlackBerry, U.S. Cellular and Jackson Hewitt. Prior to joining Transparent, Stephanie was Senior Vice President at Starcom MediaVest Group, where she oversaw reviews and negotiations with global technology platforms for the media agency’s entire network as part of the Digital Center of Excellence team. Stephanie began her career at Performics, where she designed optimization products that focused on SEO, user experience and content management.

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Bryan Simpkins

Bryan Simkins

Partner, Technology

As a founding member of Transparent Media Partners, Bryan focuses on helping brands navigate the complex advertising technology landscape. Bryan was previously Senior Vice President of the Technology and Activation Group at Starcom. He led programmatic implementation and measurement for more than 30 of the agency’s clients. Additionally, Bryan led digital media buying at Digitas and played a key role in developing the Accuen trading desk for Omnicom. He also spent six years in the marketing department at FedEx, overseeing all aspects of digital marketing.

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Bryan Simpkins

Scott Cunningham

Advisor, Technology

Scott Cunningham is an internet publishing pioneer, technology executive, and entrepreneur. He founded the IAB Technology Laboratory, the digital advertising and marketing industry’s central technical standards body and was the architect of many programs operated by the Trustworthy Accountability Group, the organization established to root out fraud and other crimes from the digital advertising supply chain. Cunningham is author of the L.E.A.N. Principles aligning the industry to better user experience and has a long executive history in digital publishing and technology including engineering high volume economic solutions and social designs for Federated Media, USA TODAY and Digital First Media news information network.

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Chris Marshall

Advisor, Analytics

In addition to serving as advisor, Chris is the head of product development for Ardent Analytics, a sister agency to Transparent Media Partners. Ardent builds one-of-a-kind software solutions that use behavioral and search analytic data to help marketers understand consumer demand. Chris oversees the development of tools that assesses billions of real customer searches, unlocking insight into what people really want. He applies these insights to help clients create a competitive advantage by creating a clear path for the company’s partners to convert general interest into consumer action. Chris has also architected enterprise data solutions for brands that include Samsung, Anheuser-Busch, U.S. Cellular, Best Buy and BlackBerry.

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Kevin Butler

Director, Accounts

Kevin specializes in bridging the gap between communication strategy and performance marketing activation. He has managed digital acquisition marketing for brands that include General Motors, Procter & Gamble and Circuit of the Americas. Kevin also led the implementation of a self-serve DSP for ESPN, determining the optimal data providers and segments and onboarding a new process across the marketing department.

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Megan Sullivan

Director, Accounts

Megan has been a pioneer in programmatic media, helping brands like Kraft adopt self-service buying and first-buying data execution. She has extensive experience in tag management system efforts, dynamic content optimization and dashboard reporting. Megan also specializes in verification, viewability and fraud audit efforts to ensure clients have a transparent view of their media buys. Her past clients include Kellogg, Wrigley, Heinz, Burger King, Harley-Davison and Blackberry.

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Beth Milligan

Director, Accounts

Beth brings extensive media strategy experience across a variety of categories, including consumer package goods, finance and technology. Prior to joining the Transparent team, Beth oversaw digital go-to-market strategies for Procter & Gamble, helping Tide adopt an “always on” approach to digital. Beth was also instrumental in helping Oral-B and Crest set their vision for data management and implement the infrastructure across their online and offline marketing to enable better decision-making.

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Matt Reder

Director, Accounts

Matt has vast experience in leading communications planning, media strategy, and holistic activation for top brands such as Spotify, ESPN and Hallmark. He has pushed marketers to reimage optimal ways of using data and technology to drive media effectiveness including onboarding various MarTech systems as well as overseeing multi-touch attribution solutions. Matt specializes in mobile and has educated both agency and brand teams on advancing capabilities throughout his career.

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Michael Sims

Director, Technology

Michael is an industry-leading technologist with experience across data center management, database administration, industrial engineering, and IT infrastructure and security. He has spent his career leading global accounts in technology infrastructure discussions and platform selection, deployment, and execution. At Publicis’s VivaKi COE for digital media, Michael performed deep dives into ad tech, fraud detection, content and audience verification, and programmatic technologies. He has worked with clients including Microsoft, P&G, Disney, Twitter, and Samsung, among others.

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John Domanico

Analyst, Accounts

John is an experienced data analyst and integrated strategist, specializing in deriving actionable insights from data. Prior to joining Transparent Media Partners, John managed digital planning and activation for brands within the automotive, education and nonprofit categories. John also served on the advisory board for several data metrics and measuring initiatives during his tenure at Starcom MediaVest Group.

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UK Partners


Ryan Kangisser

Stack I/O Managing Partner

Over the last 14 years, Ryan has advised some of the world’s leading brands on how to derive greater value and productivity from all facets of their digital marketing.Starting his career at leading independent digital agency Profero, where he cut his teeth in all areas of digital marketing, he turned to consulting in 2005 joining Ebiquity where he was instrumental in developing digital auditing in the UK. In 2010, he joined MediaSense to launch their digital practice advising brands on areas such as organisational design, agency search & selection, technology strategy and deployment and digital performance. Spotting a clear need for impartial and transparent advice in the advertising and marketing technology area, he established Stack I/O in 2016. Regarded as a thought leader and agitator in the media industry, Ryan was recognised in 2011 in MediaWeek’s 30 under 30. He creates comprehensive strategies for UK and multinational brands seeking data and technology driven digital marketing acceleration.


Martin Brown

Stack I/O Managing Partner

Martin is a digital native having spent the last 13 years in the industry working in London, Sydney and New York. Martin spent six years running business for Yahoo! in APAC, returning to London to take up a Senior Position within their EMEA organisation. From there he moved into nascent technology and data space, joining market leading programmatic technology provider DataXu as VP and Managing Director. Martin led the ‘ground up’ development of DataXu’s European business. His time there included market leading innovation in data analytics and working with early adopter brands looking to bring technology capability ‘in house’. After three years he moved to New York to run Data Xu’s East Coast operation where he significantly expanded the region. Whilst there he was promoted into the role of Senior Vice President.