David J Lesser
Founder, President & CEO
David started Nexum in 2002 to create a security products and services firm that puts clients first and foremost. A technologist, businessman, and member of multiple industry advisory boards, David brings the pragmatic, no-nonsense approach he instills at Nexum to all our industry relationships. His approach to risk mitigation focuses on excellent technical design and intelligent cost control, as well as finding and nurturing top personnel who embrace the same philosophy. David is a service-disabled veteran who spent his time in the Navy running nuclear reactors on U.S. Navy carriers, and went on to receive his degree in nuclear engineering from the University of New Mexico.
Vice President of Sales
Nathan brings over 20 years of sales experience to the team, and is responsible for all sales activities. Nathan’s experience with Nexum hails back to 2010, and he worked his way up the ranks until he was promoted to Vice President of Sales in 2021. Utilizing his expertise in building brand awareness, Nathan constantly focuses on growing Nexum. He ensures Nexum assists customers with their security requirements by focusing on real-world solutions and bringing new technologies to market. In his free time, he enjoys spending time with family and friends, skiing, golf, and mountain biking.
Vice President of Technology
J.D. Butt has over 30 years’ experience designing, testing, and implementing secure architectures for networks, application deployments, and software. J.D. has been with Nexum since 2004, and directs Nexum’s managed services offerings, internal IT, and ensures that Nexum’s best-of-breed technology selections are made based on actual testing and verification. J.D. designed Nexum’s managed security services (MSSP division) standards, processes, procedures, and much of the technology back-end. He is responsible for maintaining compliance of Nexum’s MSSP services with SOC 2 Type 2 standards and managing the annual AICPA audits.
Vice President of Strategy
Ron is responsible for defining the strategic vision for security solutions and applying consistent methodologies and procedures. He works with the Nexum team to provide thought leadership, keeping our customers informed of the latest security strategies and threats. With over 30 years of experience in the security industry prior to joining Nexum, Ron has served as an advisory member on various industry boards and consortiums, and been a featured speaker at events worldwide. He holds Bachelor’s and Master’s degrees in Nuclear Engineering from the University of Michigan at Ann Arbor. After hours, Ron is a professional pianist and spends his weekends touring around the country playing music.
Vice President and General Counsel
An attorney and systems security specialist, Mike has worked in risk management on both the legal and technical fronts since 1993. He has been a regular author and speaker on security and policy, ethics, and technology law. Before joining Nexum in 2004, Mike served as General Counsel and Director of Labs at Neohapsis, was Director of Security and Network Infrastructure for an e-commerce startup, and built and audited corporate policy and security architecture for the Tribune Company. Mike lives in New England, where he enjoys hiking year-round and supporting nonprofits as a volunteer board member and pro bono counsel.
Vice President and Controller
Greg has over 30 years of diverse experience in corporate accounting and finance in various industries. He joined Nexum in 2010 and leads the Orders and Finance/Accounting teams. Greg is a firm believer in a hands-off management style and surrounds himself with great people who embody the same approach. Greg is a graduate of Indiana University – Bloomington with a Bachelor of Science in Accounting.
Director of Security Services
Bill has over thirty years of information security experience, working as both an information security executive and as a consultant in a variety of sectors, including human resources outsourcing, health care services, financial services, the wireless telecom industry, large manufacturing and technology companies, federal agencies, and public utilities. His team performs assessments and advisory engagements including red team exercises, penetration and application testing, policy review, and security organization assessments. Bill’s experience spans real-world problem solving from IT process and procedure development to high-security systems design and testing. Prior to joining Nexum, Bill headed consulting entities and ran governance at multi-billion dollar enterprises.
Director of Human Resources
Terry brings 20 years of human resources experience to the team, and has been with Nexum since 2010. She is versatile, with a practical hands-on approach, leveraging strong expertise in planning and implementing all facets of human resources operations. Terry holds a Society for Human Resource Management: Senior Certified Professional (SHRM-SCP) certification. Prior to Nexum, she worked for such dynamic and diverse organizations as Aladdin Knowledge Systems and Amerisource Bergen.
Director of Business Operations
Megan is responsible for making sure everything runs smoothly. With over ten years of experience in operations, she joined the team in 2017 as Nexum’s “Salesforce Ninja,” managing and administering key enterprise systems to improve our effectiveness and efficiency. Today she also leads our Business Development and Sales Operations teams, who build pipeline with our technology partners and ensure customer orders are processed promptly and accurately. Her weekends are devoted to family time, with swimming lessons, taekwondo, softball, dance, gardening, cooking, and fort building. When Megan gets a rare quiet moment, you can find her reading a book or completing a jigsaw puzzle.
Director of Engineering Solutions
Jody started his career at Nexum in 2017 as a Sr. Security Engineer and made the jump to management a year later. His network security career began in 1998 with the U.S. Air Force for the 51st Combat Communication Squadron, handling WAN/LAN infrastructures across multiple countries as a combat controller. Jody has over 20 years of experience in network configuration, design, and implementation and has done extensive enterprise data network support, project management, and hardware evaluation. As head of Nexum’s Engineering and Project Management teams, he prides himself on being the “fixer.”
Director of Managed and Support Services
As head of Nexum’s three Security and Network Operations Command Centers (SNOCCs) since 2010, Joe delivers rapid and effective assistance to our customers across the country in both proactive and reactive scenarios. With nearly 30 years of industry experience at large enterprises and service providers, his goal is to lead with a focus on practicality and situational awareness, to ensure his teams effectively navigate the battlefield of InfoSec products, strategies, and threats. Outside of the office, Joe can be found wandering about his beloved San Juan mountains of Southern Colorado, or, on occasion, the streets of Rome.
Senior Marketing Manager
Kathy joined Nexum in 2012 and has been part of the Marketing team since 2016, managing and executing on various field and channel marketing components to increase demand generation. She focuses on developing innovative and targeted marketing strategies encompassing virtual and in-person events, programs, and promotions to drive new and cross-sell business. Kathy’s marketing automation experience and creative approach have helped build dynamic and compelling marketing campaigns to support Nexum’s goals. She enjoys being a teammate in competitive bocce ball leagues in her free time.
Melanie has been with Nexum since 2019, leading all digital marketing activities, company branding, and design efforts. Her organization, editorial skills, and creativity are significant contributors to the Marketing team. She has over ten years’ experience in brand development, event management, content generation, and web and graphic design across several industries (including cybersecurity, education, and non-profits). Melanie is an avid animal lover and enjoys volunteering as an event coordinator in the Chicago animal rescue community in her spare time.