Contact Us

Mailing Address & Phone

General Correspondence to:

11921 Rockville Pike, Suite 100

Rockville, MD 20852


Telephone: (301) 984-4400


Facsimile: (301) 984-7600


Billing and Financial Correspondence to:

P.O. Box 3987

Bay Saint Louis, MS 39521


Chris J. Hamilton, P.E., Chairman Emeritus

.(JavaScript must be enabled to view this email address)

Chris J. Hamilton, P.E. logo

Chris Hamilton was Chairman and Chief Executive Officer of the Alliance from March of 2015 through May of 2017. He is the Chief Operating Officer of Ultra Safe Nuclear Corporation. Chris has served on the Alliance Board since 2013 and has more than 40 years in the nuclear engineering field. He hold a B.S. in Physics From Georgia Institute of Technology, an M.S. in Nuclear Engineering Reactor Physics also from GIT. He holds a MBA from San Diego State University and a certificate from the Executive Program for Scientists and Engineers from University of California at San Diego. During his tenure, Chris transitioned the direction of the Alliance from a domestic focus to a global perspective for the advanced reactor program. Under his direction, the Alliance reorganized the operations and structured new leadership poistions.  Also, the Alliance organized and sponsored the HTR2016 International High Temperature Reactor Conference held in Las Vegas Nevada and signed collaborating agreements with international partners to advance technology and design initiatives for HTGRs. 

John Mahoney, PMP, Treasurer and Chief Financial Officer

.(JavaScript must be enabled to view this email address)

John Mahoney, PMP logo

John Mahoney is the incorporating officer of the Alliance. He was Secretary-Treasurer from 2010 through July 2013 and has been elected to serve another 2-year term starting in March of 2015 and has been re-affirmed as the Alliance's Chief Financial Officer for 2017 through 2018. John has a 35-year background in the energy and telecommunications industries. He is President and Chief Operating Officer of High Expectations International, LLC which provides project management and business consulting for clients. John holds a BBA from Northwood University and a MS in Management from Troy University. His experience includes work in utility operations, construction, engineering, maintenance, planning, information technology, and telecommunications as well as project and program management. Mr. Mahoney is a member of the American Nuclear Society where he is Past-Chair of the Human Factors, Instrumentation and Controls Division. He is President Emeritus of the Project Management Institute Mississippi Chapter. For more information, see

Donald Hoffman, Chairman and Chief Executive Officer

.(JavaScript must be enabled to view this email address)

Donald Hoffman logo

Donald Hoffman was elected as Chairmance and CEO in May of 2017. Donald is the President & CEO at EXCEL Services Corporation. He previously served the Alliance a Vice-Chair. Hoffman served as the 59th president of the American Nuclear Society. He is the Chair of the Virginia Nuclear Energy Consortium Authority which is charged with the responsibility for making the Commonwealth a national and global leader in nuclear energy and to serve as an interdisciplinary study, research, and information resource for the Commonwealth on nuclear issues. He is the Co-Chair of the ANS Special Committee on Nuclear in the States which shall identify and review: state and regional-opportunities for new nuclear development in the US; state-level legislative and regulatory barriers preventing such development; federal policies that have a direct impact on state level decision-making; lessons learned from the new nuclear development projects currently under construction, and determine the best course forward. He is also the president of Eagle Alliance, a U.S. based grassroots organization that represents all facets of nuclear science and technology. Donald served in the U.S. Nuclear Submarine Navy as a senior reactor operator and engineering officer. Previously, Mr. Hoffman was a branch chief and a lead reviewer at the U.S. Nuclear Regulatory Commission. He holds a B.S. in Nuclear Science and Engineering. For more information, see

Finis Southworth Ph.D., Chief Technology Officer

.(JavaScript must be enabled to view this email address)

Finis Southworth Ph.D. logo

Dr. Southworth is the Chief Technology Officer in a new Alliance Board role for 2017. Previously he was with AREVA from 2007 until his retirement in September 2015. He has had a 40-year career spanning work on intellectual property, research and development, the Fukushima nuclear plant disaster in Japan, staff management and as an adjunct professor at Idaho State University's business school. Finis has been on the Board of the Alliance since its inception in 2010 serving as the Secretary-Treasurer and Assistant Executive Director.  Finis remains involved in HTGR technology development efforts which has been a passion of his since his early career days. During his distinguished career, he has held positions with Florida Power & Light [now NextEra Energy] and at the Idaho National Laboratory.


Jason Lang, Secretary and Chief Administrative Officer

.(JavaScript must be enabled to view this email address)

Jason Lang logo

Jason Lang was appointed as Secretary in 2017. Jason has been active with the Alliance since SGL joined us in 2011. He has been involved in several projects including our website support and development and project work from 2012 through 2014. Jason has been the sitting Board member for SGL Group from 2012 through 2014 and again in 2016.  Mr. Lang Joined the SGL Group team in 2003. He is a Certified Six Sigma Black Belt and his work included accountability for timely and full delivery of Lean projects, benefits and costs, communications, and senior leadership project reviews. He was also responsible for setting the vision for improvement objectives, as well as performing process and statistical analysis to identify improvement opportunities. Since 2011, have functioned as a Technical Sales Manager within SGL. 


Joseph Kowalewski, Executive Technical Advisor

Joseph Kowalewski logo

Joe is a leader in the nuclear power industry and known for his fleet operations background, most recently at Entergy. With more than 20 year’s management and executive level experience he is supporting the officers by providing effective advice in the areas of nuclear operations and the environment. In his advisory role, Mr. Kowalewski will provide input and guidance on technology development, infrastructure development and siting requirements.  His related experience in utility operations, technical management, cost management and regulatory requirements brings valued experience to our team.  He is helping the Alliance to steer developments relevant to HTGR technology in the current domestic and international markets. Joe holds a Master’s of Energy from Tulane University, a BS-Mechanical Engineering from the University of Rochester, and a Senior Reactor Operator Certification.


Member Login

Forgot your password?