Executive Management

Mariam Sorond is the Board Chair and Chief Executive Officer of NextNav (Nasdaq: NN), where she leads the development of groundbreaking terrestrial 3D positioning, navigation, and timing (PNT) solutions to backup and complement GPS. Her work addresses a vital national security imperative: strengthening the nation’s PNT infrastructure to ensure continuity and precision in critical applications.

With nearly three decades of experience spanning mobile, wireless, fixed, and satellite networks, Mariam brings a rare combination of technical depth and strategic leadership to the role. Prior to joining NextNav, she held senior executive positions at VMware, CableLabs, and DISH Network, driving innovation across 5G, broadband, and edge technologies.

Mariam has also served in key advisory roles for the NTIA and FCC, helping shape spectrum policy and communications infrastructure, and is currently on the Board of Directors at CTIA, the wireless industry association. She is widely recognized for her ability to commercialize emerging technologies and guide organizations through critical moments of transformation.

Jim Black is NextNav’s General Counsel and Corporate Secretary, where he leads the company’s legal, compliance, and corporate governance functions. He oversees all legal operations, contracts management, regulatory compliance, corporate governance, and intellectual property strategy while delivering expert counsel on securities law, risk mitigation strategies, and complex corporate transactions.

With 20 years of legal experience advising public company leadership teams and boards of directors, he is an experienced attorney with valuable in-house counsel expertise. Jim navigates complex legal landscapes while ensuring business decisions align with legal and regulatory requirements, providing clear guidance to executive leadership as NextNav evolves.

Before joining NextNav, Jim served as the general counsel of Terran Orbital Corporation, where he managed legal operations for the NYSE-listed satellite manufacturer and led the company through its recent sale to Lockheed Martin. His distinguished career also includes serving as the chief legal officer of Nasdaq-listed Osiris Therapeutics and senior legal positions at Ultra Electronics, Osiris Therapeutics, and Northrop Grumman.

Jim holds a Juris Doctor from the William and Mary School of Law, a Master of Arts in Anthropology from The George Washington University, and a Bachelor of Science in Anthropology from James Madison University.

Tim Gray is NextNav’s Chief Financial Officer, responsible for all financial functions, including financial reporting, treasury and financial planning and analysis (FP&A), capital formation, investor relations, and tax. He was appointed CFO in 2025, bringing strong financial expertise and industry experience to the role.

Mr. Gray most recently served more than a decade as Chief Financial Officer of Anterix. Prior to Anterix, he held multiple senior finance leader positions at MedImmune, Inc., a subsidiary of AstraZeneca including Senior Vice President and Chief Financial Officer.

Earlier in his career, Mr. Gray served in finance positions at AOL and Nextel and started his career at Deloitte & Touche LLP. He is also a member of the Audit Committee of the Children’s Inn at the National Institutes of Health. Mr. Gray received a Bachelor of business administration in accountancy from the University of Notre Dame and is a certified public accountant.

Renee Gregory serves as Vice President of Regulatory Affairs, leading NextNav’s regulatory approval process and compliance work with a major focus on securing FCC approvals essential to NextNav’s mission to provide a robust terrestrial complement and backup to GPS. In this role, she drives a comprehensive regulatory strategy in close coordination with team members across the organization and key external partners and stakeholders.

Her federal experience includes serving as Senior Policy Advisor for the White House Office of Science and Technology Policy and key advisory roles at both the National Telecommunications and Information Administration and Federal Communications Commission. In the private sector, she held leadership positions at Google and prominent international law firms, where she advised technology and telecommunications clients. Her expertise centers on navigating the complex interplay of business strategy, technology, regulatory and policy frameworks to deliver effective solutions.

Renee holds a J.D. from Georgetown University Law Center and a B.A. from Yale University.

As Executive Vice President and Chief Operating Officer, Susan Insley oversees NextNav’s program management and operations, product and software, IT & security, and human resources.

A seasoned leader with over 25 years of experience in people management, finance, and business operations, Susan has held key roles at renowned technology companies, including VMware, VeriSign, and Intel. She excels in aligning organizational strategy with business goals, driving transformative changes that enhance operational efficiency and elevate profitability. With a proven track record of optimizing processes and cultivating high-performing teams, Susan consistently delivers measurable, meaningful results on a global scale.

Prior to her expanded role, Susan served as NextNav’s Chief People Officer, where she successfully transformed the company’s people strategy and enhanced employee engagement worldwide. Her talent for orchestrating enterprise-wide alignment across complex organizations enables her to identify strategic opportunities and implement effective solutions.

Susan earned her bachelor’s degree in finance from the University of Georgia and received certifications in Internal Audit and Risk Management Assurance. Beyond her professional achievements, she serves on the board of Team Telomere, a non-profit organization supporting individuals affected by Telomere Biology Disorders.

Marissa Mitrovich is the Vice President of Government Affairs where she leads the company’s engagement with Capitol Hill, the Administration, and strategic advocacy partners to advance NextNav’s commitment to providing next-generation location technologies and a robust ground-based complement and backup to GPS.

She most recently served as Vice President of Public Policy for the Fiber Broadband Association, where she led federal and state advocacy for a membership of more than 600 organizations spanning the fiber ecosystem, from network operators to equipment manufacturers and service providers.

A recognized leader in tech and telecom policy, Marissa brings over two decades of experience in government and public affairs, strategic advocacy, and industry leadership across major corporations, industry associations, and government affairs firms. She held leadership roles at Frontier Communications and Verizon, where she navigated complex regulatory landscapes and built the cross-sector coalitions that helped secure fiber’s place in the Bipartisan Infrastructure Law’s BEAD program. At WIA – The Wireless Infrastructure Association and the multiclient government relations firm The Washington Group, she developed deep expertise in spectrum and wireless infrastructure policy. Washingtonian named her one of Washington’s most influential people in the sector in 2024 and 2025, and The Hill named her to its Top Lobbyists list in 2023, 2024, and 2025.

Marissa holds a Master’s in Political Management from The George Washington University and a Bachelor of Arts in Anthropology and Sociology from Agnes Scott College. She is a frequent speaker and media spokesperson on digital infrastructure and the policy foundations of resilient connectivity. Beyond her professional responsibilities, Ms. Mitrovich is a champion of women in technology and policy. She was a founding board member of the Global Women’s Innovation Network (GlobalWIN) and continues to serve on its Advisory Council.

John Kim leads NextNav’s technical strategy on the company’s vision to deliver a terrestrial complement and backup to GPS over 5G networks. The forward-thinking leadership he has established has helped to position the company as a pioneer in this mission-critical technology domain.

A dynamic executive with over 20 years of expertise across wired, wireless, and cable industries, John brings valuable experience from both innovative startups and Fortune 200 corporations. His career spans technology leadership roles across the telecommunications ecosystem, including positions at VMWare, CableLabs, DISH Network, and Time Warner Cable.

John holds a PhD in Electrical Engineering from Georgia Institute of Technology, a Masters in Electrical Engineering from the University of Michigan, and a Bachelor of Science in Electrical Engineering from Carnegie Melon University.

As Co-Founder and CTO of NextNav, Arun Raghupathy leads the company’s direction in technology innovation and engineering development. Currently he’s guiding the development of NextNav’s next-generation Positioning, Navigation & Timing (PNT) technology, which leverages more than a decade of innovation and incorporates 5G broadband radio access technology and advanced positioning reference signals – designed to meet the demands of an increasingly PNT-reliant world. Arun played a pivotal role in architecting NextNav’s 3-D PNT solutions and services, contributing to foundational IP and driving system, hardware, and software design. He holds more than 50 patents.

Before co-founding NextNav, Arun spent over a decade at Qualcomm and Texas Instruments. At Qualcomm, he contributed to transmitter design and helped develop the first CDMA direct-conversion chipset for mobile handsets. At Texas Instruments, he led the GPS systems team in the development and implementation of advanced GPS signal processing techniques used in smartphone multi-radio chipsets.

Arun received the 2024 Distinguished Alumni Award from the University of Maryland’s Department of Electrical & Computer Engineering. He holds a Ph.D. and M.S. in Electrical Engineering from UMD and a B.Tech. from IIT Madras.

Vijay Venkateswaran is the Chief Business Development Officer at NextNav, where he leads the company’s business and technology ecosystem development, strategic partnerships, and go-to-market initiatives for terrestrial Positioning, Navigation, and Timing (PNT), resilient timing, advanced sensing, and 900 MHz spectrum solutions for 5G and 6G broadband networks. He drives strategic partnerships with mobile and satellite network operators, technology providers, public safety and government agencies, and critical infrastructure operators to accelerate adoption of NextNav’s spectrum, 5G-based PNT and Sensing platforms and drive commercial growth.

With over 25 years of executive leadership experience across telecommunications, wireless, cloud, and critical infrastructure, Vijay has successfully built and led strategic growth programs spanning mobile services, broadband infrastructure, private wireless network deployments, spectrum investment, and emerging technology commercialization. Prior to joining NextNav, he held senior leadership roles with Charter Communications, Verizon, Ligado Networks, Accenture, GE Ventures, and was the CEO of Viventum where he served high-profile Fortune 500 and Private-Equity backed companies across the telecommunications, power utility, information technology and industrial technology sectors.

Vijay is also an inventor and holds five U.S. patents in communications and wireless technologies. Vijay earned an MBA from the University of Virginia Darden School of Business, a Master’s of Engineering in Electrical Engineering from the University of Virginia, and a Bachelor of Science in Electrical Engineering from George Mason University. He actively serves on the George Mason University Foundation Board of Trustees and the College of Engineering and Computing Advisory Board.