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MISTRAS GROUP > INVESTOR RELATIONS > Corporate Governance > Executive Officers

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NYSE: MG
$19.63  
Feb 20, 2018     4:02 PM ET
Delayed 20min. by eSignal
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Executive Officers

Sotirios J. Vahaviolos
Founder and Executive Chairman
Sotirios Vahaviolos

Dr. 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 and Chief Executive Officer until 2017, and as President until 2016. 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.

Holdings: 10,559,127 shares     View Transactions
Date Type Shares Traded Price Range
Jan 2, 2018 Disposition (Non Open Market) 936 23.47
Aug 15, 2017 Disposition (Non Open Market) 1,079 18.88
Aug 8, 2017 Sell 90,490 21.25
Jul 11, 2017 Sell 94,877 21.08
Jun 6, 2017 Sell 94,206 21.23
Jun 1, 2017 Disposition (Non Open Market) 9,596 20.92
May 8, 2017 Sell 95,557 20.93
Apr 13, 2017 Sell 94,607 21.14
Mar 20, 2017 Acquisition (Non Open Market) 11,053 n/a
Mar 8, 2017 Sell 89,166 22.43
Feb 14, 2017 Sell 85,985 23.26
Jan 12, 2017 Sell 81,103 24.66
Dec 13, 2016 Sell 92,795 21.55
Nov 4, 2016 Sell 95,980 20.84
Oct 25, 2016 Sell 85,234 23.46
Sep 8, 2016 Acquisition (Non Open Market) 36,382 n/a
Sep 8, 2016 Disposition (Non Open Market) 12,317 24.60
Aug 18, 2016 Disposition (Non Open Market) 4,231 24.94 - 25.24
Aug 16, 2016 Acquisition (Non Open Market) 113,348 n/a
Aug 20, 2015 Disposition (Non Open Market) 7,642 15.45
Aug 19, 2014 Disposition (Non Open Market) 10,181 n/a
Aug 19, 2013 Disposition (Non Open Market) 2,539 18.00
Aug 15, 2013 Disposition (Non Open Market) 6,563 18.50
Aug 14, 2013 Acquisition (Non Open Market) 12,745 n/a
Aug 19, 2012 Disposition (Non Open Market) 2,472 21.97
Aug 15, 2012 Acquisition (Non Open Market) 37,244 n/a
Aug 15, 2012 Disposition (Non Open Market) 3,321 21.40
Aug 19, 2011 Disposition (Non Open Market) 2,472 17.74
Aug 15, 2011 Acquisition (Non Open Market) 40,301 n/a
Aug 19, 2010 Acquisition (Non Open Market) 30,000 n/a
Aug 16, 2010 Buy 15,100 9.76
Aug 13, 2010 Buy 9,900 9.89
Oct 14, 2009 Acquisition (Non Open Market) 422,435 n/a
Oct 14, 2009 Sell 234,000 11.63
Oct 8, 2009 Buy 100 12.30
Oct 7, 2009 Statement of Ownership 0 n/a
Dennis M. Bertolotti
President and Chief Executive Officer
Dennis Bertolotti

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 he was a Vice President at the time of the acquisition. Mr. Bertolotti has been in the NDT business for over 25 years, having previously held ASNT Level III certifications and various American Petroleum Institute certifications. He received his Associate of Science degree in NDT from Moraine Valley Community College in 1983, and a Bachelor of Science and MBA from Otterbein College.

Jonathan H. Wolk
Senior Executive Vice President and Chief Operating Officer
Jonathan Wolk

Jonathan H. Wolk is Senior Executive Vice President & Chief Financial Officer. He joined MISTRAS in November 2013 with 30 years of experience providing financial leadership and driving strong results. Before joining MISTRAS, Mr. Wolk was most recently the Senior Vice President and Chief Financial Officer of American Woodmark Corporation, a publicly-traded manufacturer of kitchen and bath cabinets. He began his career at KPMG and also held senior financial positions at Pitney Bowes and GE Capital. Mr. Wolk earned a Bachelor of Science degree in Accounting from the State University of New York at Albany, where he graduated Summa Cum Laude, and is a Certified Public Accountant.

Holdings: 80,361 shares     View Transactions
Date Type Shares Traded Price Range
Jan 2, 2018 Disposition (Non Open Market) 487 23.47
Nov 20, 2017 Disposition (Non Open Market) 2,741 21.33
Aug 22, 2017 Buy 2,500 17.41
Aug 18, 2017 Disposition (Non Open Market) 549 17.71
Jun 1, 2017 Disposition (Non Open Market) 3,330 20.92
Mar 20, 2017 Acquisition (Non Open Market) 4,435 n/a
Nov 21, 2016 Disposition (Non Open Market) 2,741 22.49
Sep 8, 2016 Acquisition (Non Open Market) 9,751 n/a
Sep 8, 2016 Disposition (Non Open Market) 4,502 24.60
Aug 16, 2016 Acquisition (Non Open Market) 35,382 n/a
Dec 10, 2015 Disposition (Non Open Market) 2,741 20.44
Oct 20, 2015 Acquisition (Non Open Market) 17,500 n/a
Aug 10, 2015 Buy 2,000 14.89
Nov 18, 2014 Disposition (Non Open Market) 2,116 16.94
Nov 13, 2014 Buy 3,000 17.05
Nov 18, 2013 Acquisition (Non Open Market) 25,000 n/a
Michael J. Lange
Senior Group Executive VP Business Development & Strategic Planning; Vice Chairman
Michael Lange

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.

Holdings: 283,042 shares     View Transactions
Date Type Shares Traded Price Range
Jan 2, 2018 Disposition (Non Open Market) 468 23.47
Oct 23, 2017 Disposition (Non Open Market) 732 20.70
Aug 18, 2017 Disposition (Non Open Market) 563 17.71
Aug 15, 2017 Disposition (Non Open Market) 480 18.88
Jun 1, 2017 Disposition (Non Open Market) 4,000 20.92
Mar 20, 2017 Acquisition (Non Open Market) 4,158 n/a
Oct 24, 2016 Disposition (Non Open Market) 523 21.00
Oct 17, 2016 Disposition (Non Open Market) 3,217 20.60
Sep 8, 2016 Acquisition (Non Open Market) 11,409 n/a
Sep 8, 2016 Disposition (Non Open Market) 3,939 24.60
Aug 18, 2016 Disposition (Non Open Market) 1,497 24.94 - 25.24
Aug 16, 2016 Acquisition (Non Open Market) 40,550 n/a
Oct 21, 2015 Disposition (Non Open Market) 523 18.74
Oct 20, 2015 Acquisition (Non Open Market) 17,500 n/a
Aug 20, 2015 Disposition (Non Open Market) 2,536 15.45
Oct 22, 2014 Acquisition (Non Open Market) 6,500 n/a
Aug 19, 2014 Disposition (Non Open Market) 3,622 n/a
May 2, 2014 Sell 14,118 22.80
May 1, 2014 Sell 6,238 22.43
Apr 24, 2014 Sell 11,708 23.37
Apr 23, 2014 Sell 25,367 23.95
Apr 22, 2014 Sell 17,295 23.73
Apr 21, 2014 Sell 9,981 23.60
Feb 20, 2014 Sell 12,269 23.47
Feb 19, 2014 Sell 13,529 23.94
Feb 18, 2014 Sell 3,000 24.26
Jan 30, 2014 Sell 11,967 23.97
Jan 15, 2014 Sell 19,773 24.67
Jan 14, 2014 Sell 20,227 24.91
Oct 15, 2013 Acquisition (Non Open Market) 10,000 n/a
Aug 19, 2013 Disposition (Non Open Market) 1,027 18.00
Aug 15, 2013 Disposition (Non Open Market) 2,074 18.50
Aug 14, 2013 Acquisition (Non Open Market) 4,257 n/a
Jun 19, 2013 Automatic Sell 12,122 22.08
Jun 18, 2013 Automatic Sell 7,078 22.03
May 22, 2013 Automatic Sell 800 22.02
Apr 1, 2013 Automatic Sell 10,000 23.49
Mar 8, 2013 Automatic Sell 10,000 22.04
Feb 1, 2013 Automatic Sell 10,000 22.16
Jan 2, 2013 Automatic Sell 13,171 24.98
Dec 6, 2012 Automatic Sell 1,489 22.00
Dec 5, 2012 Automatic Sell 8,231 22.09
Dec 4, 2012 Automatic Sell 7,109 22.05
Aug 19, 2012 Disposition (Non Open Market) 997 21.97
Aug 15, 2012 Acquisition (Non Open Market) 13,075 n/a
Aug 15, 2012 Disposition (Non Open Market) 1,048 21.40
May 7, 2012 Sell 16,227 23.80
May 7, 2012 Option Execute 16,227 13.46
May 2, 2012 Sell 10,000 23.26
May 2, 2012 Option Execute 10,000 13.46
Michael C. Keefe
Executive Vice President, General Counsel and Secretary
Michael Keefe

Michael C. Keefe is Executive Vice President, General Counsel. He joined Mistras in late 2009. Michael served in various legal roles with Lucent Technologies and AT&T as well as with a private practice at New Jersey's largest law firm, McCarter & English, LLP. In 1996, he began working for Lucent Technologies, where he served as Law Vice President and Corporate Counsel for ten years. Most recently, Michael joined International Fight League, a sports promotion company, as Executive Vice President, General Counsel and Corporate Secretary, and eventually its President, General Counsel and Chief Financial Officer and led the sale of the company's assets and the Chapter 11 liquidation of its operating subsidiary. Michael graduated with a Bachelors of Science in Accounting from Seton Hall University and continued his education at Seton Hall University School of Law, where he graduated first in his class with a Juris Doctorate degree. Before starting his legal career, Michael served as a Certified Public Accountant for Coopers & Lybrand, a predecessor firm to PricewaterhouseCoopers, LLP. He worked in accounting for seven years before making the switch into the legal profession.

Edward J. Prajzner
Senior Vice President, Chief Financial Officer and Treasurer
Edward Prajzner

Edward J. Prajzner is Senior Vice President, Chief Financial Officer and Treasurer.  He joined MISTRAS in January 2018.  Before joining MISTRAS Group, Mr. Prajzner was Chief Financial Officer and Secretary of CECO Environmental Corp, a publicly-traded global diversified and energy technology company. He began his career with Ernst & Young and also held senior financial positions with CDI Corporation and American Infrastructure.  Mr. Prajzner earned a Bachelor of Science degree in Accountancy from Villanova University, an M.B.A. (Finance) from Temple University and is a Certified Public Accountant.

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