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Investor Relations

Board of Directors


Sotirios J. Vahaviolos
Founder and Executive Chairman

Sotirios J. Vahaviolos is the company’s Founder and Executive Chairman. After founding MISTRAS in 1978 under the name Physical Acoustics Corp., Dr. Vahaviolos served as Chairman, President, and Chief Executive Officer until 2017. Prior to joining Mistras, Dr. Vahaviolos worked at AT&T Bell Laboratories. Dr. Vahaviolos received a BS in Electrical Engineering and graduated first in his class from Fairleigh Dickinson University and received a Master of Science (EE), Masters in Philosophy and a Ph.D.(EE) from the Columbia University School of Engineering. During Dr. Vahaviolos' career in NDT, he has been elected Fellow of The Institute of Electrical and Electronics Engineers, a member of The American Society for Nondestructive Testing (ASNT) where he served as its President from 1992-1993 and its Chairman from 1993-1994, a member of Acoustic Emission Working Group (AEWG) and an honorary life member of the International Committee for Nondestructive Testing. Additionally, he was the recipient of ASNT's Gold Medal in 2001 and AEWG's Gold Medal in 2005. He was also one of the six founders of NDT Academia International in 2008.

Dennis M. Bertolotti
President and Chief Executive Officer (CEO); Director

Dennis M. Bertolotti is the President and Chief Executive Officer of MISTRAS Group, having previously served as Group Executive Vice President, Chief Operating Officer, and President of Services of the Americas. Mr. Bertolotti has been with MISTRAS since MISTRAS acquired Conam Inspection Services in 2003, where Mr. Bertolotti was a Vice President at the time of the acquisition. Mr. Bertolotti has been in the NDT business for over 25 years, and previously held ASNT Level III certifications and various American Petroleum Institute certifications, and received his Associate of Science degree in NDT from Moraine Valley Community College in 1983. Mr. Bertolotti received a Bachelor of Science and MBA from Otterbein College.

James J. Forese

James J. Forese has served as a Director since August 2003. Mr. Forese joined Thayer | Hidden Creek in July 2003 and currently serves as an Operating Partner and Chief Operating Officer.

Prior to joining Thayer | Hidden Creek, Mr. Forese worked at IKON Office Solutions, most recently as the Chairman and Chief Executive Officer. Mr. Forese serves as non-executive Chairman of Spherion Corporation, a director and the audit committee chair of IESI-BFC Ltd. and a director of several private organizations. Mr. Forese served as a director, the audit committee chair and member of the compensation committee of Anheuser-Busch Companies Inc. Mr. Forese received a B.E.E. in Electrical Engineering from Rensselaer Polytechnic Institute and an M.B.A. from Massachusetts Institute of Technology.

Richard H. Glanton

Mr. Glanton is Chief Executive Officer and Chairman of the Philadelphia Television Network, a privately-held media company. From May 2003 to May 2007, Mr. Glanton served as the Senior Vice President of Corporate Development for Exelon Corporation. From 1986 to 2003 he was a partner in the law firm of Reed Smith LLP in Philadelphia. Mr. Glanton currently is a director of Aqua America, Inc. and The CEO Group, Inc. and is a member of the Board of Trustees of Lincoln University. Mr. Glanton received a BA in English from West Georgia College and a J.D. from University of Virginia School of Law.

Manuel N. Stamatakis
Manuel N. Stamatakis has served as a Director since 2002. Mr. Stamatakis is the Chairman and Chief Executive Officer of Capital Management Enterprises, Inc., a financial services and employee benefits consulting company headquartered in Valley Forge, Pennsylvania. Mr. Stamatakis currently serves as Chairman of the Board of Drexel University College of Medicine, the Philadelphia Shipyard Development Corporation, and the Pennsylvania Supreme Court Investment Advisory Board. Mr. Stamatakis received a Bachelors' of Science in Industrial Engineering from the Pennsylvania State University in 1969 and received an honorary Doctorate of Business Administration from Drexel University.
Michael J. Lange
Senior Group Executive VP Business Development & Strategic Planning; Vice Chairman

Michael J. Lange is Senior Group Executive VP Business Development & Strategic Planning; Vice Chairman. He joined MISTRAS when it acquired Quality Services Laboratories in November 2000. He was elected a Director in 2003. Mr. Lange is a well recognized authority in Radiography and has held an ASNT Level III Certificate for almost 20 years. Mr. Lange received an Associate of Science degree in NDT from the Spartan School of Aeronautics in 1979.

Nicholas DeBenedictis

Nicholas DeBenedictis served as Chief Executive Officer of Aqua America, Inc. from July 1992 until his retirement in July 2015, and has been the Chairman of the Board since May 1993, becoming a non-executive Chairman of the Board upon his retirement as CEO.  He also served as Chairman and Chief Executive Officer of Aqua America’s principal subsidiaries, including Aqua Pennsylvania, Inc.  Mr. DeBenedictis served as Senior Vice President for Corporate Affairs of PECO Energy Company (now known as Exelon Corporation) from 1989 until 1992; as President of the Greater Philadelphia Chamber of Commerce from December 1986 to April 1989; and as the Secretary of the Pennsylvania Department of Environmental Resources from 1983 to 1986.  Mr. DeBenedictis is also a director of Exelon Corporation and P.H. Glatfelter Company, and also serves on the boards of Pennsylvania area non-profit, civic and business organizations.  Mr. DeBenedictis received a B.S. in business administration and a M.S. in environmental engineering and science from Drexel University.

Curtis Weldon

W. Curtis Weldon was elected to our board at the 2014 annual shareholders meeting.  Mr. Weldon served 20 years in the United States Congress as Representative for the 7th District of Pennsylvania from 1987 to 2007.  Mr. Weldon retired from Congress as Vice Chairman of the Armed Services Committee and Vice Chairman of the Homeland Security Committee and during his tenure also served as Vice Chair, House Armed Services Committee; Chairman, Tactical Air and Land Forces Subcommittee; Chairman,  Military R&D Subcommittee; Vice Chair, Homeland Security Committee; and Member, House Science Committee.  Mr. Weldon also organized and chaired the National Disaster Fire and EMS Caucus for 20 years and served as America’s Honorary Fire Chief.  Mr. Weldon also served on 60 Bi-Partisan Congressional Delegations to over 125 countries.  Since his retirement from Congress, Mr. Weldon founded Jenkins Hill International in 2007, which provides national and international consulting services.  Mr. Weldon also serves on the board of advisors or directors of numerous organizations, including the U.S. Congress Defense & Security Task Force, Department of Homeland Security Technical Advisory Panel, Center for Campus Fire Safety, and Transeco Energy Corporation, and is actively involved in fire safety and prevention and first responders organizations.  Mr. Weldon received his BA in Humanities with concentration in Russian Studies from West Chester University, an associate’s degree in Fire Science from Delaware County Community College and in November 2014 was given the National Public Service Award from the Safe America Foundation.