Peter W. Ghiorsi, MBA, FAHP and Dan Sorrenti have devoted their entire professional careers to the field of philanthropy. In 1989, after many years of service to a major teaching medical center, they combined their professional ambitions and skills to form Ghiorsi & Sorrenti, Inc. Together, and with a team of talented executives who are experts in all aspects of philanthropic consulting, they have built a firm that has experienced steady growth as it has partnered with hundreds of non-profits throughout the United States in raising billions of dollars in philanthropic support. They are committed to being actively involved in serving all of the firm`s clients. This is as true today as it was when GSI opened its doors in 1989.Click on a name to learn more about that GSI team member.

Peter W. Ghiorsi, MBA, FAHP
Chairman & CEO

Dan Sorrenti
President & COO

By far, GSI`s greatest asset is its team of talented executives who are seasoned professionals and experts in all aspects of philanthropic consulting. Having held in-house management positions with various non-profit organizations, each has a keen understanding and appreciation of institutional protocol and operations.

Arthur S. Collier, FAHP
Senior Executive Counsel

Christina Cron
Administrative Assistant

Matthew R. Ghiorsi, MBA
Vice President for Strategy and Operations

Debra A. Gill, MPA, CFRE, FAHP
Vice President
Director of Western Division

Barbara Kraskian
Research Specialist

John G. Modzelewski, MBA
Vice President

Allen J. O`Keefe
Senior Vice President

Cathy Pastene
Executive Operations Manager

Christen A. Reese, MA
Account Executive & Data and Information Specialist

Scott J. Rosenkrans, MS
Senior Executive Counsel

Howard A. Siegel
Vice President

Glenn Vallach
Vice President of Public Relations & Communications

Lee A. Williamson, MBA
Vice President


Ann Armater

Ms. Armater is Vassar Brothers Hospital Foundation`s (Poughkeepsie, NY) founding Executive Director, having assumed the position in 1986. Over the years her role has expanded and now she serves as the Vice President for Development for Health Quest, Vassar`s parent organization.

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