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Sigma Science

Our Leadership Team

Gilbert Torres

President and Chief Executive Officer (CEO)

Gil is responsible for establishing Sigma's vision, values, and culture and for executing Sigma's corporate strategy. Before joining Sigma, he held leadership roles in Nuclear Operations, Engineering, Nuclear Safety and Nuclear and High Hazard Packaging and Transportation. Gil is passionate about attracting and retaining the highest caliber of technical experts and providing employees with rewarding and challenging career opportunities. He has a Master of Science degree in Industrial Engineering and a Bachelor of Science in Mechanical Engineering.

In McCann

Executive Vice President

In is responsible for Sigma's client portfolio and executing Sigma's day-to-day operations. He brings over 20 years of engineering experience and expertise to Sigma, delivering over $600M of technical systems to the DoD, DOE, NNSA, and the U.S. Intelligence Community in support of nuclear non-proliferation, counter-proliferation, counterterrorism, and U.S. wartime efforts. In his spare time, In enjoys traveling with his family and supporting the Albuquerque homeless community. In has a Master of Science in Computer Science and a Bachelor of Science in Biochemistry.

Wayne Hohs

Vice President of Operations

Wayne is responsible for the management and execution of Sigma’s client portfolio. He has 40 years of nuclear industry experience, including program and project management, nuclear facility and reactor startup and operations, spent nuclear fuel management, and transuranic mixed low-level waste disposition. Wayne has a Bachelor of Science in Fire Protection and Safety Engineering Technology and a Master of Business Administration.

Kimberly Pena

Chief Financial Office

Kimberly is responsible for Sigma's finances and financial actions. She has more than 30 years of experience in finance, accounting, and regulatory compliance. Kimberly is a Certified Public Accountant with a Bachelor of Business Administration, concentration in accounting.

Robyn Bryant

Director of Proposal Management and Business Development Services

Robyn is responsible for overseeing and managing Sigma’s proposal management activities and identifying and developing new business opportunities. She brings 17+ years of proposal management and BD support experience, including 5 years across the DOE/NNSA complex. Robyn has a dual Bachelor of Arts in English/Mass Communications and a Master of Arts in Rhetoric and Professional Writing.

Michael Hoover

Director of Contracts

Michael is responsible for Sigma’s contract negotiations and coordinating contractual items with Sigma clients and teaming partners. Additional responsibilities include helping manage Sigma’s diverse project portfolio and helping Sigma implement its strategic plan. He has more than 13 years of experience in federal contracting with the Department of Defense and the U.S. Intelligence Community. Michael is a Certified Federal Contract Manager. He has a Bachelor of Science in Criminal Justice and a Master of Business Administration.

Johanne Joseph

Director of Human Resources

Johanne is responsible for administering Sigma’s human resources functions, including organizational development, personnel performance, employee relations, recruitment, compensation, and benefits. He brings 20 years of human resources experience, including 15 years in the DOE and DOD arenas. He has a Bachelor of Science degree in Business and holds certifications from Professionals in Human Resources, the Society for Human Resources Management, and Six Sigma Greenbelt.

David Bland

Senior Program Manager

David is responsible for Sigma’s DOE Office of Nuclear Energy portfolio. He has more than 30 years of experience in the commercial utility and federal nuclear industries, including experience in nuclear power plant construction and startup activities at five commercial nuclear plants. David has a Bachelor of Science in Nuclear Engineering and a Master of Business Administration.

Charles Keller

Senior Program Manager

Charles is responsible for business development and program management for Sigma’s joint venture – Sigma-NAC Nuclear Solutions – as well as our work with the DOE Office of Nuclear Energy. He has extensive experience in decommissioning, waste management, nuclear operations, technology development/selection, regulatory compliance, and business operations. He has worked on projects in the United States, Canada, United Kingdom, Europe, Japan, and the Middle East. He holds a Bachelor of Science degree in nuclear engineering.

Marc Peel

Senior Program Manager

Marc is responsible for leading and managing Sigma’s support services staff at the National Nuclear Security Administration (NNSA) Savannah River Project Management Office (SRPMO). He has extensive project management experience in engineering, construction, and startup and commissioning, and he provides technical and management recommendations to the NNSA's Federal Project Directors and functional managers. Marc has a Bachelor of Science in Business and a Master of Business Administration.

Marc Peel

Sigma Science


Jennifer Gamble

Jennifer is the Managing Director of OnPoint Power, LLC, a woman-owned small business founded in 2002. She has more than 30 years of experience in the nuclear industry, including commercial nuclear power and facility decommissioning, environmental cleanup, and clean energy. She previously served as CH2M Hill’s Vice President for Strategic Initiatives in Nuclear and was a key leader in the firm’s strategic expansion into international nuclear new build program management.

Dr. Donald L. Cook, PhD

Dr. Cook is a former Deputy Administrator for Defense Programs at the NNSA. He was responsible for managing the U.S. nuclear security enterprise comprised of nuclear weapons laboratories and production plants. He is also the former CEO and Managing Director of the United Kingdom’s Atomic Weapons Establishment. Dr. Cook also served in several leadership positions at Sandia National Laboratories.