Leadership Team

Daniel V. Berkon

Dan Berkon is the Founder and CEO of Culmen International. He is an international expert in WMD nonproliferation, counter-illicit trafficking, and international procurement and logistics. Dan has served as an advisor on international security programs to the U.S. Departments of Defense, State, Energy, Justice and Homeland Security. His contributions have included nuclear security initiatives in the former Soviet Union, maritime security programs in Africa, border security around the world, and counterterrorism in the U.S.

Prior to founding Culmen International in 2004, Dan spent 11 years at SASI, another U.S. Government contractor. There Dan rose from Director of International Programs to the Chief Operating Officer and Executive Vice President. In 1992, he worked at the U.S. Department of Commerce in the East Europe Business Information Center.

Dan holds a MBA in International Business from Georgetown University, and a BA in International Relations from the University of California Los Angeles (UCLA). Additionally, he is fluent in German. Dan is a personal recipient of the DoD David Packard Award for Acquisition and Logistics, the Admiral Stark Award for Innovation, the Defense Threat Reduction Agency Outstanding Team Award, and the NAVAIR Award for Acquisition Excellence.

Myron Thomas

Myron Thomas serves dual roles as Culmen International’s Chief Operating Officer (COO) and Chief Financial Officer (CFO), leading efforts to optimize operations and guide capital deployment to maximize organic and inorganic growth. As a member of the executive leadership team, Myron has an integral role in executing the Culmen’s strategic plan, developing and implementing its financial strategy, and providing servant leadership to ensure Culmen’s Divisions and Programs are well supported to exceed client expectations. 


Prior to joining Culmen, Myron led multiple high-growth, private equity-backed companies as President, COO, and/or CFO. Most recently, he served as COO at Melwood, a mission-driven Federal contractor utilizing the AbilityOne program to employ individuals of differing abilities. Myron began his career in the audit and transaction services divisions at PwC and KPMG, respectively. After serving as an international ex-pat for Corning Incorporated, and after obtaining his MBA, he served as CFO for Corning’s corporate venture capital division, focused on fiber optic and photonics innovations. Throughout his 25-year career in Finance and Operations, Myron has established a reputation for building high-performing teams and aligning operating and financial metrics to support business strategy and high-growth. Myron has led multiple equity and debt financings and raised in excess of $1.2 Billion.


Myron holds a Master’s Degree in Public/Private Economic Policy (MPA) from Harvard University, a Master’s in Business Administration (MBA) with a focus on Finance and Entrepreneurial Management from the Wharton School, University of Pennsylvania, and a Bachelor’s of Science (BS) Degree in Accounting from Florida A&M University. He is certified as a Certified Public Accountant (CPA), Chartered Global Management Accountant (GCMA), and Certified Valuation Analyst (CVA) and has earned a Six Sigma certification. Myron is a member of the Washington, DC/Baltimore Chapters of Young Presidents’ Organization (YPO) and Leadership Greater Washington (LGW).

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Mark Dumas

Mark Dumas is Culmen International's Chief Strategy Officer, leading the company’s efforts around analytics, strategic technical planning and thought leadership, partnership and channel development, and mergers and acquisitions. Mark is a well-respected entrepreneur, geospatial scientist and technology innovator with more than 20 years of experience. 

Prior to joining Culmen, Mark was the Chief Strategy Officer for PlanetRisk where he tackled new ideas and concepts around global big-data and risk analytics. He was also the successful founder and CEO of SPADAC, a leader in geo-spatial intelligence that in 2010 became a part of publicly-traded GeoEye. As a senior executive with GeoEye until 2013, he played a key role in the organization’s continuing mergers and acquisitions activities. As part of GeoEye, SPADAC became an essential contributor in the area of geospatial predictive analytics for the US government.


Mark graduated from Mississippi State University with an electrical engineering degree and volunteers as a Cubmaster with Boy Scouts of America as well as coaching youth basketball. He was first exposed to geospatial technologies while completing an internship with Florida Power & Light.

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Simon Limage

Simon Limage is Culmen's Vice President of Nonproliferation and International Security. In this role he is leading program teams executing a range of contracts at federal agencies including equipment procurement and sustainment, training, logistics, and Advisory and Assistance Services. Simon also provide senior subject matter expertise and is involved with business development and strategic planning.


Prior to joining Culmen, Simon served in a variety of capacities in Congress and at the State Department (DOS), most recently as the DOS Deputy Assistant Secretary for Nonproliferation Programs. In this role from 2011 to 2017, he managed 120 staff and $200 million in global programs that reduce the threat posed by weapons of mass destruction. Simon was the United States Representative to the Boards of the International Science Centers based in Kazakhstan and Ukraine and served as the U.S. co-chair of the Global Initiative to Combat Nuclear Terrorism.  Also, within the DOS he served as chief of staff for the Under Secretary of State for Arms Control and International Security.


Simon holds a Master’s Degree in Foreign Service and a Master’s in History from Georgetown University as well as a B.S. in International Relations and a B.A. in History from Tufts University. He is a non-resident scholar at George Washington University’s Elliott School in the Institute for Security and Conflict Studies. Throughout his career he has received several awards for superior management and for his role in the removal of chemical weapons from Syria and Libya and for ratification of the New START Agreement.