Executive Leadership

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John Heller

Chief Executive Officer

John is the Chief Executive Officer of Amentum, which provides a broad array of technical and management services to the U.S. federal government and other national governments worldwide. His responsibilities include…

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Jill Bruning

President, Engineering, Science & Technology

Jill Bruning is the President of Amentum’s Engineering, Science and Technology Group. Her business delivers engineering and technical services across the full engineering life cycle supporting scientific research and development, technology integration, digital engineering, C5I, training, data analytics, cyber security, and business process outsourcing.

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Dr. Karl Spinnenweber

President, Critical Missions

Karl Spinnenweber is the President of Amentum’s Critical Missions Group. In this capacity, Karl is directly responsible for leading the delivery of advanced technical solutions and services to Amentum’s client base worldwide. With an international workforce of more than 24,000; the Critical Missions Team provides ...

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Mark Whitney

President, National Security

Mark is the President of the Amentum National Security group, where he oversees the day-to-day operations; manages profit and loss, strategic initiatives, and business development activities; and oversees administrative and operations support functions for Amentum’s work for clients in the United States, ...

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Charles Mathis

Chief Financial Officer

Charles “Charlie” Mathis has over 14 years of public company experience as a CFO. He is currently responsible for all finance and accounting activities at Amentum, including financial strategy, finance business operations, financial planning and analysis, government compliance, internal audit, tax and treasury.

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Chico Moline

Chief Information Officer

Chico is the Chief Information Officer of Amentum. His responsibilities include Amentum’s enterprise transformation initiatives, which extend beyond technology to include environmental, health and safety, quality and continuous improvement.

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Sean Mullen

EVP, Business Development

Sean Mullen is Executive Vice President of business development (BD) at Amentum. He is responsible for leading the company’s business development and growth strategy, including leveraging our world class capabilities and deep customer insight to drive differentiated solutions that support our customer’s mission objectives.

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Patricia Munchell

Chief People Officer

Patricia is the Chief People Officer of Amentum. Her responsibilities include leading all aspects of the company’s talent strategy and talent management that supports a diverse global workforce.

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Roela Santos

SVP, Marketing & Communications

Roela is a global communications and marketing executive with a 28-year record of advancing business strategy and building brands. She operates with a holistic approach to stakeholder communications, including customers, investors, employees, media, and market influencers, ...

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Stuart Young

EVP, General Counsel

Stuart leads the legal function for Amentum, providing advice on the full range of government contracting issues. He supervises company litigation and also provides support in the areas of labor and employment law, compliance, export control, and international law.

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Adam Harrison

SVP, Strategy & Corporate Development

Adam Harrison serves as the senior vice president and head of strategy and corporate development for Amentum. In this role, Adam is responsible for leading the development and execution of Amentum’s corporate growth strategy including mergers and acquisitions (M&A) related initiatives.

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Dr. Rob Smith

VP, Diversity, Equity & Inclusion

Dr. Rob Smith is Vice President of Diversity, Equity & Inclusion at Amentum. In this role, he is responsible for leading our diversity, equity and inclusion vision and strategy by developing and implementing programs and initiatives that advances Amentum’s business objectives and reinforces our organization’s culture.

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Jeff Treffinger

SVP, Environmental Health & Safety

Jeff serves as Senior Vice President of Environmental, Health and Safety (EHS) at Amentum and has led the EHS programs since 2010. He has dedicated his entire career to leading EHS and quality programs in support of military, government and commercial operations and led multiple successful pursuits of EHS & quality management systems certifications.

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Karina Vollmer

Chief Ethics & Compliance Officer

Karina is the Chief Ethics & Compliance Officer at Amentum. Her responsibilities include Amentum’s ethics and compliance program, Amentum’s Code of Conduct, as well as training the workforce on ethics and compliance issues and leading investigations as needed.

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