Bryan Wiener

Chief Executive Officer

Bryan Wiener is a 25-year advertising industry veteran who specializes in successfully growing companies in highly-disruptive environments.

Before joining Comscore as Chief Executive Officer, Mr. Wiener served first as CEO and later as executive chairman of 360i, where he pioneered a new kind of agency designed to help brands capitalize on change, leveraging deep expertise in data, technology and innovation to drive measurable impact across all media platforms. While there, Mr. Wiener scaled the company from fewer than 40 to more than 1,000 employees worldwide, and partnered with some of the largest and most iconic brands in the world including Coca-Cola, Nestle, Mondelēz, Capital One, NBCUniversal and Pernod-Ricard at a critical moment when marketers were grappling to effectively reach their customers. In 2010, 360i’s position as a leader in the new media landscape led the company to be acquired by global advertising holding company Dentsu Inc. After almost a decade as CEO, Mr. Wiener became executive chairman of 360i in 2014.

From 2014 through 2015, Mr. Wiener concurrently served as chairman of Expion, a social content marketing software company that was successfully acquired by Sysomos. Mr. Wiener also previously held a series of senior management positions at public companies including serving as president of global services at the early VoIP software company Net2Phone, where he led a two-year, $75 million EBITDA turn-around. Prior to Net2Phone, Mr. Wiener served as general manager at, one the first-ever social media companies. 
Mr. Wiener currently serves on the Agency Advisory Board for the Interactive Advertising Bureau (IAB) and the S.I. Newhouse School of Public Communications at Syracuse University, where he was inducted into the world-renowned media and communications school’s Hall of Fame. Mr. Wiener has been named a "Media Maven" by Advertising Age and to the "Mediaweek 50 List" (now part of Adweek). 

Sarah Hoffstetter


Sarah is a decorated industry veteran with a proven track record of helping marketers transform their businesses to thrive amid rapid media disruption. 

Before joining comScore as President, Sarah spent 13 years at 360i leading the agency’s adaptability, helping marketers capitalize on industry changes, building best in class practices across creative, media and digital. Under her stewardship, 360i was recognized by Ad Age as one of the top advertising agencies for eight consecutive years.

Driving Sarah’s success is her solutions-oriented mindset and ability to steer client business through disruption. Since joining 360i in 2005, Sarah created and evolved 360i’s capabilities, equipping brands such as Oreo, HBO, Nestlé and others with the tools and knowledge to tackle their most pressing business challenges and leverage their paid, earned and owned media strategies through integration. Under Sarah’s watch, 360i grew from a small startup with 30 employees to a household name within the industry, with offices across the country and a staff of 1,000 strong. Sarah has also shepherded many of the agency’s social good initiatives, including launching “The Den,” a free workshop providing digital education to nonprofit marketers.

Sarah was named to the 2014 AAF Hall of Achievement and the 4A’s list of 100 People Who Make Advertising Great. She has been recognized by Ad Age’s "40 Under 40," the Adweek 50, Adweek Power 100 and has been inducted into the Word of Mouth Marketing Hall of Fame. She has also taken the stage at Cannes Lions Creativity Festival and Fortune Most Powerful Women Next Gen Summit, among others.

Sarah was 360i’s CEO from October 2013 to April 2018, when she was named Chairwoman. Before becoming CEO, Sarah was 360i’s President and Senior Vice President of Brand Strategy & Emerging Media, a role in which she founded the agency’s social media practice ahead of the proliferation and growth of social platforms that would follow. Prior to joining 360i, she was President and Founder of Kayak Communications, a marketing agency focused on developing brand strategy and communications plans for new media brands. Before starting her own agency, Sarah spent 10 years at Net2Phone, one of the world’s first providers of VoIP technology, in a series of senior leadership positions.

In Nov. 2018, Sarah was elected to the Board of Directors for Campbell Soup Company (NYSE: CPB).

Kathy Bachmann

Chief Commercial Operations Officer

Kathy is a proven growth leader with success in building new revenue streams and improving profitability by leveraging data, analytics and technology for SaaS start-ups to Fortune 200 global B2B and B2C organizations.

She has extensive experience leading company change initiatives, driving new customer acquisitions, establishing successful enterprise client relationships and optimizing cross-functional relationships to transform company growth.

Prior to joining Comscore as the Chief Commercial Operations Officer, Bachmann was Chief Operations Officer at Throtle, a high-growth AdTech, data solutions company. She was EVP and Managing Director of the Americas for MarketShare and led Customer Success for Neustar, MarTech companies focused on customer data and cross-platform measurement. In these roles, she helped the organizations move with increased velocity and efficiency, leading the launch of a new product from concept to beta customer roll-out within 3 months and evolving sales and customer success functions to reduce friction points. She has also held executive management roles at American Express, Wyndham Worldwide and Quest Diagnostics. 

Greg Fink

Chief Financial Officer

Mr. Fink is an accomplished senior finance executive with more than 25 years of experience in accounting, financial reporting, business analytics, budgeting, internal controls, and talent development. Prior to joining Comscore on October 3, 2017, he served as Senior Vice President, Controller and Chief Accounting Officer at Fannie Mae, where he led a team of 600 professionals and oversaw a multi-billion dollar annual expense budget. With extensive experience in SEC reporting, Mr. Fink had responsibility for Sarbanes-Oxley compliance and Audit Committee reporting. Prior to joining Fannie Mae in 2006, he served as Vice President of Financial Reporting and Policy at MCI, Inc. and was a Senior Manager at Deloitte.

Mr. Fink holds a B.S. in Business Administration with an accounting emphasis from San Diego State University and is a licensed Certified Public Accountant in Virginia.

Carol DiBattiste

General Counsel & Chief Compliance, Privacy and People Officer

Carol DiBattiste is General Counsel & Chief Privacy and People Officer at Comscore. Ms. DiBattiste brings extensive legal, privacy, compliance and human resources leadership experience from both the public and private sectors to the company.

She advises the company on all legal matters, including strategic corporate initiatives, technology alliances, business transactions and intellectual property protection, litigation, and also oversees the company’s human resources and facilities departments. As Chief Privacy Officer, Ms. DiBattiste is responsible for establishing the company's privacy and data security policies, overseeing the implementation of such policies, and educating legislators, the press, industry and consumer groups and the general public about the company's approach and commitments to consumer privacy.

Prior to joining Comscore, she served as the Executive in Charge and Vice Chairman of the Board of Veterans’ Appeals at the U.S. Department of Veterans Affairs. Ms. DiBattiste’s public sector work also included senior executive positions in the Departments of Defense, Justice and Homeland Security. Among her many distinguished roles, she served as the Under Secretary of the United States Air Force, Department of Defense, confirmed by the U.S. Senate, where she led a $70 billion, 710,000 military and civilian department responsible for recruiting, training and education, and readiness, and earlier as Principal Deputy General Counsel for the U.S. Navy. She was also the Deputy Administrator of the Transportation Security Administration (TSA), Department of Homeland Security, where she led a $5.3 billion, 55,000-employee agency. Ms. DiBattiste also served as a federal prosecutor and Deputy United States Attorney in the Southern District of Florida and as the Director of the Executive Office for United States Attorneys, where she led the operations of the 94 United States Attorneys’ Offices nationwide.

In the private sector, Ms. DiBattiste served as Chief Privacy Officer at ChoicePoint, where she also served as General Counsel and Chief Compliance Officer. ChoicePoint was acquired by Reed Elsevier/LexisNexis during her tenure. At LexisNexis/Reed Elsevier, she served as Senior Vice President, Privacy and Security. She has also served as General Counsel and Chief Administrative Officer at Geeknet, Inc., and Chief Legal, Privacy and Administrative Officer at Education Management Corporation. Previously, Ms. DiBattiste was a partner in the international law firm of Holland & Knight, where her specialties included government relations, corporate diversity counseling, and civil and criminal litigation. 

Ms. DiBattiste graduated with a B.A. from LaSalle University and holds a J.D. from Temple University School of Law and an LL.M. from Columbia University School of Law. In addition, she has completed the Strategic Leadership Program at Harvard Business School and served in the U.S. Air Force as an officer and judge advocate (JAG).

Dan Hess

Chief Product Officer

Dan Hess has worked at the intersection of digital technology and data-driven marketing and sales throughout his career. In his role as Chief Product Officer, Mr. Hess leads an organization driven to delight Comscore clients by creating industry-leading solutions that deliver on our cross-platform vision.
Mr. Hess previously served as Comscore’s Executive Vice President, Products from September 2016 to December 2017. Prior to joining Comscore, Mr. Hess served as an investor and advisor to start-ups in digital media and marketing, software-as-a-service and e-commerce. Previously, Mr. Hess served as Chief Corporate Development Officer and of Rewards Network, a loyalty marketing and financial services company. Prior to that, Mr. Hess was CEO and Co-Founder of Local Offer Network, which created an omnichannel predictive modeling and personalization platform that was acquired by one of the world's leading marketing services firms.
Earlier in his career, Mr. Hess was one of Comscore’s first employees, leading corporate marketing and building multiple commercial teams including its retail, travel, automotive and technology products and practices.
When Mr. Hess isn't relentlessly focusing on innovation, quality, execution and efficiency at Comscore, he enjoys spending time with family and supporting animal rescue organizations.

Joe Rostock

Chief Information and Technology Officer

Joe Rostock is a proven and passionate leader in the delivery of innovative technologies that drive value. His deep, cross-industry experience extends more than 30 years, ranging from executive roles within the world’s second largest telecommunications company to the launch of a start-up business aimed to radically improve how data is secured, integrated and managed. 

In his role as Chief Information and Technology Officer, Mr. Rostock is responsible for the design, development and operational delivery of solutions across Comscore’s business to advance innovation while driving growth and efficiencies.

Prior to joining the Comscore team, Mr. Rostock served as Chief Technology Officer at healthcare technology company, Inovalon, where he led the design and delivery of an award-winning, real-time analytics platform. Mr. Rostock also served as Vice President and Chief Technologist for The Alliance for Telecommunications Industry Solutions (ATIS), a technology and solutions development organization for the telecommunication industry. While at ATIS, he led strategic initiatives, designed and developed solutions, as well as competitive business models for communications and infrastructure providers. Preceding his position at ATIS, Mr. Rostock served in many ascending roles at Verizon Communications, most recently serving as Senior Fellow where he was responsible for strategy and planning programs supporting the CIOs of Verizon’s five business units to structure the company’s future direction in cloud technology offerings, virtualization initiatives, development of mobility platforms and business management analytics. During the launch of his career, Mr. Rostock held several technical staff positions, in which he spearheaded deployment of Verizon’s first voice over IP network, enabling IP carrier termination service from Europe into New York City. 

Mr. Rostock was awarded a US Patent for Access to Intelligent Network Service Control and holds a bachelor’s degree in Radio, Television and Film from Temple University, as well as completing graduate studies in Computer Science at St. Joseph's University. 

When Mr. Rostock isn't leading technology and operations at Comscore, he enjoys spending time with his wife, two sons and dog.

Sara Dunn

Head of Human Resources

Sara is an experienced HR leader who brings trust, accountability and grit to the heart of Comscore. With more than 20 years of human resource experience, she is known for building highly engaged, high performing cultures through seasons of rapid change.

As head of HR at Comscore, Sara leads global HR strategies, programs, and practices, overseeing the teams responsible for talent management and acquisition, learning and development, organizational design and effectiveness, and compensation and benefits.

In the nine years Sara has been with the organization thus far, she has played a critical role in anchoring people around growth in complex, innovative, and high-velocity environments. Sara’s impact has been felt widely across the organization. She is recognized as a trusted business partner with a knack for driving focus on leadership strength, talent development, improving system and operational capabilities, and culture.

Prior to joining Comscore in 2010, Sara amassed broad HR expertise across a diverse set of industries, including at AOL, ExxonMobil, and Federated Department Stores. Sara holds a Bachelor of Science in Industrial & Labor Relations from Cornell University.