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Leadership Team

David Lesser, President & Chief Executive Officer


David Lesser serves as President and Chief Executive Officer for Nexum. A technologist and businessman, David's experience in IT risk mitigation has focused on excellent technical design and intelligent cost control. Nexum's top corporate officer, David has been managing people in some form since he was 16 years old with a Total Quality Management / Leadership approach. As Nexum's President, all functional areas of the organization ultimately report to him:  sales, services, training, accounting, HR, legal and business services.

Nexum was founded in 2002 with the goal of creating a no-nonsense IT security products and services firm that puts the client first and foremost. In his complex past, David has served in a variety of roles, including management and sales, not to mention a tour of duty running nuclear reactors on U.S. Navy carriers. He holds a BS in Nuclear Engineering from the University of New Mexico.

J.D. Butt, Vice President of Solutions


J.D. Butt is a network security technologist with over 20 years' experience designing, testing, and implementing secure architectures for networks, application deployments, and software. J.D. serves as Nexum's Vice President of Solutions, with Nexum's Solutions (services) and first*defense® (managed services) organizations reporting to him.

J.D.'s professional experience includes founding Midwest Communications, an Internet Service Provider that ultimately consolidated over 90 smaller ISPs into a coherent, secure whole. As an ISP industry spokesperson, J.D. helped drive the CLEC competition to SBC and helped force the design and implementation of the PPPoE standard for DSL. He designed Nexum's first*defense® (MSSP division) standards, processes, procedures, and much of the technology back-end.

Prior to Nexum, J.D. was Vice President and Senior Network Engineer for Midwest Communications, where in addition to his roles as VP and Engineer, he developed consumer training, network and security monitoring systems, and event correlation engines. Much of the code was given over to Open Source projects.

Brian Haboush, Vice President of Sales and Marketing


Brian Haboush is Vice President of Sales for Nexum. Brian joined Nexum in October, 2008 as Director of Services and took over the Sales department in January, 2010.

Before he came to Nexum, Brian was a principal at a security VAR in Michigan, leading the company during its highest growth and profitability years from 1999 to 2008. Before making the leap into network security, Brian held positions at Stroh's Brewery, Ford Motor Company, Ernst & Young, Whirlpool, and Heartland Express in the areas of Logistics, Finance and Accounting, Purchasing, and Sales/Marketing. Brian holds a Bachelor's of Business Administration from the University of Michigan Business School in Ann Arbor.

Mike Scher, Vice President and General Counsel


Mike Scher serves as Vice President and General Counsel for Nexum. An attorney and systems security specialist, Mike has experience in IT risk mitigation on both the legal and technical fronts since 1993. At Nexum, he is a corporate officer and spearheads the Business Services Group, which comprises Nexum's legal department and security assessment/compliance management team.

Before joining Nexum, Mike was Director of Neohapsis Labs, an independent IT security product testing organization. He has served as Director of Security and Network Infrastructure for an e-commerce startup, and worked as a Sr. Network Security Consultant for the Tribune Company, building and auditing both corporate policy and corporate firewalls. Mike holds bachelors, masters, and JD degrees from Duke University and is ABD in a PhD program at the University of Chicago, where his research has focused on the changing law and culture of unauthorized access to computers and communications systems.

Mike is a regular author and speaker on security and policy, touching on issues such as ethics and technology law at the 14th USENIX Security Symposium, compliance and technology convergence at the July 2005 KY InfraGard meeting, authentication mechanisms and technical evidence at the ABA's 2002 Cybercrime Conference, and both compliance-related liability and single sign-on in the USENIX journal "login;" not to mention a talk on the politics of DNS at DefCon 8.

* Vice Presidents of the company are not corporate officers unless indicated.