Corporate Officers

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Steven H. Collis
Chairman, President and Chief Executive Officer
Steven H. Collis
Chairman, President and Chief Executive Officer


Mr. Collis was elected Chairman of the Board in March 2016 and has been President and Chief Executive Officer of AmerisourceBergen Corporation since July 2011. He served as President and Chief Operating Officer of AmerisourceBergen from November 2010 to July 2011. He served as Executive Vice President and President of AmerisourceBergen Drug Corporation from September 2009 to November 2010. He was Executive Vice President and President of AmerisourceBergen Specialty Group from September 2007 t... 

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Tim G. Guttman
Executive Vice President and Chief Financial Officer
Tim G. Guttman
Executive Vice President and Chief Financial Officer


Tim G. Guttman is Executive Vice President and Chief Financial Officer of AmerisourceBergen. Prior to being named to his current role in 2012, he was Vice President and Corporate Controller since joining the Company in 2002.

Prior to joining AmerisourceBergen, Guttman was Vice President of Finance at Syncor International Corporation, and also previously held financial planning and managerial positions at Disney Consumer Products, Pizza Hut, Inc., and PepsiCo, Inc. He also spent s... 

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John G.  Chou
Executive Vice President and Chief Legal & Business Officer
John G.  Chou
Executive Vice President and Chief Legal & Business Officer


John G. Chou is Executive Vice President and Chief Legal & Business Officer with responsibility for strategy, business development, innovation, information technology, legal and compliance. Prior to being named to his current position in June 2017, Mr. Chou was Executive Vice President and General Counsel of AmerisourceBergen Corporation. Before joining AmerisourceBergen in 2002, he was a partner with the law firm of Eckert Seamans Cherin & Mellott. Mr. Chou has been practicing law for ... 

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Gina K. Clark
Executive Vice President and Chief Communications & Administration Officer
Gina K. Clark
Executive Vice President and Chief Communications & Administration Officer


Gina Clark is Executive Vice President and Chief Communications & Administration Officer for AmerisourceBergen Corporation with responsibility for human resources, communications, marketing, government affairs and corporate citizenship. Prior to being named to this role in June 2017, Ms. Clark was Executive Vice President & Chief Marketing Officer where she led strategic marketing and integrated branding initiatives across AmerisourceBergen and its business units. Ms. Clark brings more than 2... 

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James F. Cleary, Jr.
Executive Vice President and Group President, Global Commercialization Services & Animal Health
James F. Cleary, Jr.
Executive Vice President and Group President, Global Commercialization Services & Animal Health


Jim Cleary is Executive Vice President & Group President, Global Commercialization Services & Animal Health. In this role, Mr. Cleary is focused on extending the work of AmerisourceBergen’s pharmaceutical commercialization solutions for manufacturers and animal health. Mr. Cleary most recently served as Executive Vice President & President, AmerisourceBergen Animal Health prior to being named to his new role in June 2017. He was Chief Executive Officer of MWI Veterinary Supply Inc., un... 

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Dale Danilewitz
Executive Vice President and Chief Information Officer
Dale Danilewitz
Executive Vice President and Chief Information Officer


Dale Danilewitz is Executive Vice President and Chief Information Officer of AmerisourceBergen. Prior to being named to his current role in 2012, he was Chief Information Officer of AmerisourceBergen Specialty Group. Dale joined the company in 1999 as Vice President of Information Technology. Prior to joining AmerisourceBergen he held other management positions with American Airlines and The Sabre Group. He also worked for Whirlpool Corporation and ran the Advanced Technology Group. He holds a ... 
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Kathy H. Gaddes
Executive Vice President and Chief Human Resources Officer
Kathy H. Gaddes
Executive Vice President and Chief Human Resources Officer


Kathy Gaddes assumed the role of Executive Vice President and Chief Human Resources Officer in April 2016. Prior to being named to her current position, Ms. Gaddes was Vice President, Group General Counsel and Secretary for AmerisourceBergen Corporation since 2012. Ms. Gaddes joined AmerisourceBergen in 2011 as Assistant General Counsel, Corporate and Securities. She has extensive experience in governance, securities, finance and corporate matters. Ms. Gaddes previously served as a lecturer-... 

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Peyton  Howell
Executive Vice President and President, Health Systems, Physician Practices and Strategic Health Solutions
Peyton  Howell
Executive Vice President and President, Health Systems, Physician Practices and Strategic Health Solutions


Peyton Howell is Executive Vice President and President, Health Systems, Physician Practices and Strategic Health Solutions. Prior to taking on this role in June 2017, Ms. Howell was EVP & President, Global Sourcing and Manufacturer Relations where she led manufacturer strategy and sourcing including brand, generic, specialty and consumer product purchasing. As part of this role, she led the creation of AmerisourceBergen Global Manufacturer Services GmbH in Bern, Switzerland which supports Am... 

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Robert P. Mauch
Executive Vice President and Group President, Pharmaceutical Distribution & Strategic Global Sourcing
Robert P. Mauch
Executive Vice President and Group President, Pharmaceutical Distribution & Strategic Global Sourcing


Robert Mauch is the Executive Vice President & Group President, Pharmaceutical Distribution & Strategic Global Sourcing for AmerisourceBergen Corporation. In this role, he is focused on creating a more cohesive customer experience and expanding the company’s operational excellence. Prior to being named to his current role in June 2017, Mr. Mauch was Executive Vice President and President, AmerisourceBergen Drug Corporation and also spent time as the Chief Operating Officer for AmerisourceBerg... 

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Sun Park
Executive Vice President, Strategy and Development
Sun Park
Executive Vice President, Strategy and Development


Sun Park is Executive Vice President, Strategy and Development. Prior to joining AmerisourceBergen in 2012, he served in various leadership roles across corporate development, corporate strategy and R&D portfolio management at MedImmune, the global biologics division of AstraZeneca. Before joining MedImmune, he held positions at Charterhouse Group International and Merrill Lynch & Company.

Mr. Park graduated from Yale University and attained his Master’s degree in Biotechnology from T... 

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Hyung Bak
Senior Vice President, Group General Counsel and Secretary
Hyung Bak
Senior Vice President, Group General Counsel and Secretary


Hyung Bak is Senior Vice President, Group General Counsel and Secretary for AmerisourceBergen Corporation. Mr. Bak joined AmerisourceBergen in June 2015 as Group General Counsel for AmerisourceBergen Drug Corporation and was named Corporate Secretary in May 2016. Prior to AmerisourceBergen, he spent nine years at Campbell Soup Company in senior legal and business roles, including as Vice President of Global Procurement, Chief Counsel to Campbell North America and Chief of Staff to the CEO. ... 

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Lazarus Krikorian
Senior Vice President and Corporate Controller
Lazarus Krikorian
Senior Vice President and Corporate Controller


Lazarus Krikorian is Senior Vice President and Corporate Controller of AmerisourceBergen. Prior to being named to his current role in 2012, he was Vice President and Assistant Corporate Controller since joining the Company in 2002.

Prior to joining AmerisourceBergen, he held other financial management positions, including Senior Assurance Manager at KPMG LLP, where he spent a decade. He holds a Bachelor of Science in the dual major of Accounting and Finance from Drexel University.

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J.F.  Quinn
Vice President and Corporate Treasurer
J.F.  Quinn
Vice President and Corporate Treasurer


J.F. “Jack” Quinn is Vice President and Corporate Treasurer, AmerisourceBergen Corporation. Mr. Quinn joined the company in 2002, and was previously Treasurer of IKON Office Solutions. Prior to joining IKON in 1994, he served in several treasury management positions at both ARCO Chemical Company and Columbia Gas System Service Corporation. Mr. Quinn also spent four years with the accounting firm of KPMG LLP.

A Certified Public Accountant and Certified Treasury Professional, Mr....