About Us

Ghiorsi & Sorrenti, Inc. is comprised of accomplished professionals with decades of experience in the philanthropic sector.  Without question, our seasoned team is the firm’s greatest asset.

GSI’s practice is soley focused on helping clients achieve optimal results ensuring maximum return on their investment.   Regularly, we are told “we never dreamed we could raise that much money”.  The bottom-line is that GSI clients of all types and sizes have raised billions of dollars employing methodologies that consistently meet, and often surpass, expectations.

To see a full list of our clients click below


GSI EXECUTIVE TEAM                   

“We wanted an organization that worked collaboratively and seamlessly with clients, teaming with them to raise donor sights, to think big and not be satisfied with current standards.  More than a quarter of a century later, we are proud to say we’ve never wavered from that ideal, reinforcing it daily with great success.  We’ve managed it with a team of like-minded staff professionals who bring extraordinary skills and dogged pursuit of excellence.” - -  Peter W. Ghiorsi, MBA, FAHP and Dan Sorrenti

Peter W. Ghiorsi, MBA, FAHP

Chairman & CEO

Dan Sorrenti

Founding Partner & President

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.

Allen J. O'Keefe

Senior Vice President

Matthew R. Ghiorsi, MBA

Vice President for Strategy and Operations

Debra A. Gill, MPA, CFRE, FAHP

Vice President and Director of Western Region

John G. Modzelewski, MBA

Vice President

Howard A. Siegel

Vice President

Glenn Vallach

Vice President of Public Relations & Communications

Dorothy A. Allen, FAHP

Senior Executive Counsel

Jay Lockaby

  Senior Executive Counsel

Robin Popp, CFRE

Senior Executive Counsel

Nicholas Hohn

 Account Executive & Data and Information Specialist

Cathy Pastene

Executive Operations Manager

Drina K. Simons

Account Executive

Robert C. Sorrenti

Account Executive

Barbara Kraskian

Research Specialist

Christina Cron

Administrative Assistant

Western Region:

27459 Frontage Road

Bozeman, MT 59715



255 Madison Avenue

Wyckoff, NJ 07481