Board Members

Our board members serve to provide guidance to ExOne's organization and vision.

From left to right: Lloyd Semple (retired as of May 12, 2021), Roger Thiltgen, Gregory Pashke, Kent Rockwell, Bonnie Wachtel, John Irvin, William Strome, pictured below is Paul Camuti. 

S. Kent Rockwell


Mr. Rockwell began serving on our Board on January 1, 2013, and has served as our Chairman since that time. He served as our Chief Executive Officer from June 2018 to May 15, 2019, and previously served as our Executive Chairman from August 2016 to June 2018 and as our Chief Executive Officer from January 1, 2013, when we were formed as a Delaware corporation, until August 2016. 

Prior to that, Mr. Rockwell served as the Managing Member of The Ex One Company, LLC, our predecessor, from 2008 until 2012. Mr. Rockwell has been the Chairman and Chief Executive Officer of Rockwell Venture Capital, Inc., a private venture capital company, since 1983 and of Appalachian Timber Services, a supplier of timber products for railroads, since 1986. Mr. Rockwell served as Vice Chairman of Argon ST, a public company engaged primarily in defense contracting, from 2004 to 2010. Mr. Rockwell served as the Chairman and Chief Executive Officer of Sensytech Inc., which was engaged in the design, development and manufacture of electronics and technology products for the defense and intelligence markets in the United States, from 1998 to 2004. He was Chairman and Chief Executive Officer of Astrotech International Corp., a public company in the oilfield supply business, from 1989 to 1997. From 1987 to 1989, he was Chairman and Chief Executive Officer of Special Metals Corp., a producer of super alloy and special alloy products. From 1978 to 1980, he was Chairman and Chief Executive Officer of McEvoy Oilfield Equipment, a producer of oilfield equipment. Mr. Rockwell served on the Board of Directors of Rockwell International from 1973 until 1982 and served as President of the Energy Products Group of Rockwell International from 1977 to 1982. 

The Board believes that Mr. Rockwell should serve as a member of the Board because he has intimate knowledge of ExOne, its business and operations and the risks, challenges and opportunities it faces. In addition, Mr. Rockwell brings to the Board more than forty years of experience with strategic planning, acquisitions and integration, marketing, finance and accounting, operations and risk management, having served in numerous executive and director positions at other public and private companies before joining ExOne. 


John Hartner

Director, Chief Executive Officer

Mr. Hartner has served as our Chief Executive Officer since May 2019 after joining the Company in November 2018 as Chief Operating Officer. He began serving on our Board on May 13, 2020.  Mr. Hartner founded Digital Industrialist LLC, a company that invests in and advises digital manufacturing businesses, in 2017 and has led the company since that time. Prior to that, Mr. Hartner served as the Chief Operating Officer of EnvisionTEC Inc., a 3D printing firm, from March 2015 to April 2017, where he was responsible for all global business operations. This role followed a nearly 15-year career leading business units of Dover Corporation across the globe from December 2000 to March 2015, where Mr. Hartner served as the President and Chief Executive Officer of the Dover Printing & Identification Segment, among other positions. Mr. Hartner represents ExOne as a founding member of the Additive Manufacturing Green Trade Association.   

Mr. Hartner received an M.B.A. from the University of Chicago — Graduate School of Business in 1989 and a B.S. in Mechanical Engineering from Villanova University in 1985. Mr. Hartner's previous business experience in digital manufacturing and global printing would provide the Board with specialized industry knowledge. As Chief Executive Officer of ExOne, Mr. Hartner also contributes his unique insight into the Company’s business operations, opportunities, and challenges.


John Irvin


Mr. Irvin began serving on our Board on January 1, 2013, when we were formed as a Delaware corporation. From October 2016 to October 2017, Mr. Irvin served as the Chief Financial Officer of Mine Vision Systems Inc., a 3D vision and mine mapping software company. Mr. Irvin has also served as a senior advisor to Rockwell Forest Products, Inc., a forest products company controlled by S. Kent Rockwell, since September 2015.

 He was previously employed by the Company, serving as Special Advisor to the Chairman of ExOne from January 2014 through August 2015 and as Chief Financial Officer from October 2012 until December 2013. From 2008 to 2012, he was President of PartnersFinancial, a national insurance brokerage company owned by National Financial Partner Corp. (“NFP”), a publicly-traded diversified financial services firm. From 1993 to 2008, he was Chairman and Chief Executive Officer of Innovative Benefits Consulting, Inc., a life insurance consulting firm and wholly-owned subsidiary of NFP. From 1983 to 1993, Mr. Irvin was a partner of Mid Atlantic Capital Group, a financial services company, which he co-founded in 1983 and where his highest position was Vice Chairman. In 1979, Mr. Irvin formed the certified public accounting firm of John Irvin and Company. From 1976 to 1979, he was an accountant for Arthur Andersen LLP. 

From 2000 to 2004, Mr. Irvin served on the Board of Directors of Sensytech Inc., which was engaged in the design, development, and manufacture of electronics and technology products for the defense and intelligence markets in the United States, and also served on its audit committee from 2000 to 2004 and as chairman of the audit committee from 2002 to 2004. Upon the merger of Sensytech Inc. into Argon ST, Inc., a public company engaged primarily in defense contracting, he served as director and chairman of the audit committee from 2004 to 2010. Mr. Irvin currently serves on the Boards of Directors of the S. Kent Rockwell Foundation and the Partners Financial Foundation, where he is Chairman of the Board. 

Mr. Irvin was selected to serve as a director of ExOne because of his significant financial and accounting experience, having served in the financial services industry for a number of years and as an accountant for Arthur Andersen LLP. Mr. Irvin brings expertise to the Board in the areas of financial analysis and reporting, internal auditing and controls and risk management oversight. He also is able to provide both strategic and operational vision and guidance to the Board, having served in several executive-level positions before joining ExOne. 


Gregory F. Pashke

Independent Director

Mr. Pashke began serving on our Board on May 18, 2016. Mr. Pashke has served as President of Pashke Consulting, a strategic, tactical and valuation consulting services company since 1997. Mr. Pashke was a founding and managing partner of Pashke Twargowski & Lee, a northwestern Pennsylvania regional certified public accountant (“CPA”) firm from 1974 to 1997. In addition to managing the firm, Mr. Pashke provided managerial and financial consulting and auditing and accounting assurance services primarily to closely held manufacturing and service enterprises. Mr. Pashke was Vice-President of Finance for Keystone Aeronautics, a multi-state air charter, aircraft sales and fuel concession enterprise from 1973 to 1974 and was a Senior Accountant with the auditing firm of Ernst & Young from 1971 until 1973. 

Mr. Pashke has been active in many professional organizations, having served on the National Governing Council of the American Institute of CPAs and as National Vice President of the Society for the Advancement of Management. He has served on the Board of Directors of the Institute of Management Accountants, Palm Beach Chapter, since 2011. Mr. Pashke also was a member of the Governing Council and the Executive Committee of the Pennsylvania Institute of Certified Public Accountants (“PICPA”), where he chaired the Long-Range Objectives and Nominations Committees. Mr. Pashke also served on the Ethics and Centennial Committees and as the President of the Erie Chapter of the PICPA. 

Mr. Pashke has obtained multiple professional designations in accounting (CPA, CMA — Certified Management Accountant), finance (CFM — Certified Financial Manager), consulting (CMC — Certified Management Consultant) and valuation (CBA — Certified Business Appraiser) and he holds an M.B.A. from the University of Pittsburgh. Mr. Pashke has also authored over thirty articles on a variety of consulting, planning, managerial, auditing, tax and organizational topics. His articles have appeared in The Futurist, Strategic Finance, the Pennsylvania and New York CPA Journals, and Renaissance Executive Forum publications. Mr. Pashke contributed chapters to several Lexis/Nexis Canadian Financial Industry texts. Mr. Pashke brings significant financial accounting and reporting, financial planning, tax, internal auditing and ethics expertise to our Board, including through his robust experience in these areas with manufacturing and service enterprises.

Chair of Nominating & Governance Committee
Member of the Audit Committee

William F. Strome

Independent Lead Director

Mr. Strome  began serving on our Board on May 4, 2015. Since August 2015, Mr. Strome has served as an adjunct professor at the John F. Donahue Graduate School of Business, Duquesne University. Mr. Strome also currently serves on the boards of the Merle E. Gilliand & Olive Lee Gilliand Foundation and Aspinwall Riverfront Park. From October 2014 to July 2017 (when the company was sold), Mr. Strome served as a director of FBR & Co. (“FBR”), a publicly traded company providing investment banking, merger and acquisition advisory, institutional brokerage, and research services. He also served as a member of the audit committee of FBR’s board. Mr. Strome previously served as Senior Vice President, Finance & Administration of RTI International Metals, Inc. (“RTI”), from November 2007 until his retirement in April 2014, during which time RTI was a NYSE-listed global supplier of advanced titanium products primarily to the commercial aerospace market. He led the public company’s strategic planning activities, acquisition and divestiture initiatives, and capital procurement as well as investor relations and treasury functions. He was also responsible for RTI’s information technology and insurance functions. 

In 2006 and 2007, prior to joining RTI, Mr. Strome was a principal at Laurel Mountain Partners where he focused on raising acquisition financing for its principal portfolio company — Liberty Waste Services. From 2001 to 2006, Mr. Strome was a Senior Managing Director in FBR’s Investment Banking group. From 1997 to 2001, he served as a Managing Director of the capital markets broker-dealer of PNC Financial Services Group, Inc. (NYSE: PNC), focusing on mergers and acquisitions as well as strategic advisory services, and from 1981 to 1997, he served as Deputy General Counsel and Corporate Secretary at PNC. 

Mr. Strome holds an undergraduate degree in Economics from Northwestern University and a J.D. and M.B.A. from the University of Pittsburgh. Mr. Strome brings a high level of financial, strategic and corporate governance expertise to the Board based on his experience as a senior financial executive officer of RTI, including leading its treasury functions, as a Senior Managing Director in FBR’s Investment Banking group, and as Deputy General Counsel and Corporate Secretary of PNC. In addition, Mr. Strome also has prior experience serving on a public company’s board and audit committee. The Board has determined that Mr. Strome’s experience with accounting principles, financial reporting and evaluation of financial results qualifies him as an “audit committee financial expert” for purposes of membership on our Audit Committee.  His business, legal, and financial experience uniquely qualifies him to serve as the independent Lead Director of our Board. 

Chair of the Audit Committee
Member of the Nominating and Governance Committee

Roger W. Thiltgen

Independent Director

Mr. Thiltgen began serving on our Board on August 8, 2018. Since 1992, he has been majority owner and President of Tanglewood Resort Properties Inc., which operates a Resort Hotel, Conference Center and Real Estate Development in North Texas. Mr. Thiltgen also currently serves as President of Champion Resources Inc., a privately held investment company dealing primarily with oil and gas and real estate investments, a position he has held since 1986. 

From 2014 to 2017, Mr. Thiltgen served as the managing member of Puris LLC, a firm primarily engaged in the manufacture of titanium powder, and to a lesser extent in printing titanium powder utilizing binder jetting 3D printers provided by ExOne. Additionally, Mr. Thiltgen previously served as a board member and Manager of Corporate Development for Astrotech International Corporation, formerly listed on the American Stock Exchange, a company that manufactured, repaired, and serviced above ground storage tanks for the oil and gas industry (1989-1996). He was also Co-Founder and President of HMT Inc., an engineering and consulting company that was acquired by Astrotech (1978-1989). At HMT, he received three U.S. patents for emission control devices manufactured and sold by HMT. 

Mr. Thiltgen holds a B.S. in Civil Engineering from The University of Wisconsin-Platteville. The Board has determined that Mr. Thiltgen’s technical knowledge, experience with the Company’s machines, and background in emerging technology businesses will assist the Board as it makes decisions to further advance binder jetting technology for industrial applications. 

Member of the Nominating and Governance Committee
Member of Compensation Committee


Bonnie K. Wachtel

Independent Director

Ms. Wachtel began serving on our Board on February 12, 2013. She has been a principal and director of Wachtel & Co., Inc., an investment firm in Washington, D.C. involved with the development of growing companies, since 1984. Ms. Wachtel has been a director of VSE Corporation (Nasdaq: VSEC), a provider of engineering services principally to the federal government, since 1991 and of Information Analysis Inc., a provider of information technology technical services, since 1992. 

Her industry experience includes service on the Advisory Committee for the National Market System Consolidated Audit Trail, LLC, an entity created by order of the SEC (2018-2020), and the Hearings Panel for Nasdaq Listing Qualifications (2006 to 2016). She practiced law at Weil, Gotshal & Manges in New York from 1980 to 1984. 

Ms. Wachtel brings substantial corporate governance and regulatory compliance expertise to our Board, having served as a director for more than a dozen public and private corporations and on the Hearings Panel for Nasdaq Listing Qualifications. She also worked for years as an attorney in private practice, during which time she focused primarily on business law, corporate finance and securities law. In addition, Ms. Wachtel holds an M.B.A. in Finance from the University of Chicago and is a Chartered Financial Analyst. As such, she brings significant expertise to the Board (and our Audit Committee, on which she serves) in the areas of financial analysis and reporting, internal auditing and controls and risk management oversight.

Member of the Audit Committee
Nominating & Governance Committee
Chair of the Compensation Committee


Paul A. Camuti

Independent Director

Mr. Camuti has served as Executive Vice President and Chief Technology and Strategy Officer of Trane Technologies plc since January 1, 2020, overseeing the company’s strategy and innovation practices, enterprise sustainability and investment strategies, and networks of excellence in areas such as modeling and simulation and digital development.

From August 1, 2011 to December 31, 2019, Mr. Camuti worked for Ingersoll Rand, where he rose to the role of Senior Vice President of Innovation and Chief Technology Officer. In that role, he led the enterprise strategy organization and oversaw the full spectrum of innovation, technology and growth initiatives within the company. Mr. Camuti also led Ingersoll Rand’s enterprise focus on sustainability, advocacy for smarter energy usage, and partnership with industry experts, academia and non-governmental organizations (NGOs).

Prior to Ingersoll Rand, Mr. Camuti was founder and president of Smart Grid Applications for Siemens Energy, Inc. from May 10, 2010 to July 31, 2011 and Chief Executive Officer of Siemens Corporate Research from April 1, 2005 to July 31, 2011, one of several Siemens Corporate Technology innovative research centers worldwide. Additional experience includes leadership roles with Siemens Energy and Automation, where he founded the company’s Industrial Software business, as well as work with Eaton Corporation and Westinghouse Electric.

Mr. Camuti serves on various boards and advisory councils, including the board of The Alliance to Save Energy and Charlotte’s Science and the board of trustees of Technology Center – Discovery Place, where he is vice-chair. Mr. Camuti is also a member of the NREL Energy System Integration Technical Review Panel and serves on the external advisory council for the P.C. Rossin College of Engineering and Applied Science at Lehigh University. Mr. Camuti holds a bachelor’s degree in Engineering from Lehigh in Bethlehem, Pennsylvania, and completed the Siemens Advanced Management Program at The Fuqua School of Business at Duke University in Durham, North Carolina. Mr. Camuti's experience in innovation, technology and sustainability within large public companies will enhance many of the Company’s current initiatives.

Member of Compensation Committee