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Company Leadership

Company Leadership Bios


Steve Selfridge is President of SOC, a leading provider of security and critical infrastructure support solutions to the U.S. government and select commercial clientele. SOC continues to expand its global presence under his leadership while living out its values of safety, integrity, diversity, and success.

Mr. Selfridge is known for building and leading high-performance multinational teams and uniting parties on a common mission and goals. As a dynamic international executive with a 30-year history of establishing and growing multi-million dollar businesses, he has demonstrated success in increasing profits and market share, having worked across six continents in highly competitive global industries.

His career includes his most recent role as Vice President of Corporate Development at Day & Zimmermann, the 53rd largest privately-held, family-owned business in the United States. He has also served as COO for Checkpoint Systems, Inc, which he helped to grow from $35M to $360M, and as CEO of Acsis Inc, which grew from $4M to $25M under his leadership.

Mr. Selfridge received his Bachelor of Arts in Accounting from Rutgers University in Camden, New Jersey, where he serves on the Leadership Council of Rutgers School of Business. He was featured in South Jersey Magazine as one of the leading Outstanding Entrepreneurs of the Year (2015) and also serves as Chair of the Foundation Board of Lourdes Hospital in Camden, New Jersey.


Billy Conner joined SOC in 2007 and currently serves as Senior Vice President of Integrated Security Solutions. As a results-driven leader, Mr. Conner continues to reinforce SOC’s core values of safety and integrity, which has contributed to some of SOC’s most successful programs. Mr. Conner has supported programs within the United States Departments of Defense and State, as well as other federal agencies. Mr. Conner currently provides direct oversight and management for SOC’s performance on the two largest U.S. government security contracts.

Over the past 18 years, Mr. Conner has served in a variety of operational and leadership positions. Prior to joining SOC, Mr. Conner was the Senior Security Program Manager in the High Threat Protection Division of the U.S Department of State. As Program Manager, Mr. Conner provided direct oversight and management of the Worldwide Personal Protective Services II program, in which he had operational and budget responsibilities in excess of $600M.  He has also served as a Director of Security and Training Operations, Close Protection Division Chief and as a SWAT Officer during his career.

Mr. Conner holds a Bachelor of Arts in Social and Criminal Justice with a specialization in security management and strategic intelligence. 


David R. Bean, General Counsel of SOC, is responsible for legal, contracts, and compliance advice and support. Before joining Day & Zimmermann, David was a member of the Squire Patton Boggs International Dispute Resolution Practice. David represented and advised governmental entities on a broad range of issues, including multifaceted matters requiring analysis of the international law of treaties, diplomatic immunity, and state responsibility.

David also served as a Judge Advocate in the United States Army. During his military service, he gained valuable experience in the areas of operational law, prosecution, administrative law, and ethics. While deployed to Afghanistan, David served as an Operational Law Attorney and as the Rule of Law adviser for the Afghan National Police’s 202nd Zone, providing counsel in the areas of human rights, prosecution and counter-narcotics.

David is a Captain in the Virginia Army National Guard. He received his Bachelor of Arts Degree from Cornell University, a Juris Doctorate from Washington and Lee University, and holds a Master’s in Education from George Mason University. Prior to his career in law, David taught high school and 6th grade mathematics in Washington D.C., serving his first two years as a Teach for America corps member.


Mark Cooper is SOC's Senior Director of Safety and Quality. He has spent the past decade helping to build SOC into a trusted provider of integrated security solutions. In his current role, he manages compliance and regulatory requirements tied to our support of the United States Government here at home and around the world. Mr. Cooper also serves as the company's lead in implementing and managing our Quality Assurance Management System to comply with the ANSI PSC.1-2012 Standard for overseas security operations. Under his leadership, SOC continues to deliver on two of its core values: Safety and Integrity.

Prior to joining SOC, Mr. Cooper held various positions with ISO 9001-certified U.S. contractors serving the U.S. Departments of Defense, Homeland Security, Commerce, Treasury, and Energy, as well as NASA. He obtained a Bachelor of Arts degree in Organizational Communication from the University of Central Florida, and holds a Six Sigma Green Belt certification.


David “Dave” Johnson is Vice President and Chief Financial Officer of SOC.  As an integral member of SOC’s executive management team, he brings more than 35 years of financial expertise and leadership to support SOC’s strategic growth initiatives. He is a key contributor to SOC’s achievement of strong financial performance and compliance as the organization continues to expand globally.

Mr. Johnson joined SOC in 2013 where he served as Vice President of Business Management to the International Defense and Diplomacy Services division.  With his guidance, some of SOC’s most important programs in support of critical U.S. national security interests underwent significant improvement, both operationally and financially.  The company is now viewed as a trusted and proven partner to multiple U.S. government agencies.

In his career, Mr. Johnson has held a number of financial leadership positions, including Group Controller, Director and Senior Director of Finance within mid-tier corporations and major Fortune 500 companies. In these positions he supported business units with portfolios of U.S. and international client contracts ranging from $0.5B to $4.3B.   Mr. Johnson holds a Bachelor of Business Administration in Finance and Management from Baylor University and completed post-graduate work at University of Washington in International Banking.


As the principal human resources executive at SOC, Susan leads and directs all strategic human resources programs. She is an influential leader spearheading a full range of SOC’s talent management strategies and initiatives, leadership development, employee engagement, change management, and M&A activities.

As a critical strategic partner to the organization, Susan brings more than 20 years of experience driving human capital strategies, leading human resources teams, and instituting competitive value-added best practices across the range of human resources functions for government contractors including: CSRA (formerly SRA International); TASC (formerly Northrop Grumman/TASC), General Dynamics, Logistics Management Institute (LMI) and Science Applications International Corporation (SAIC).

Susan holds a Master's degree in Human Resources from Virginia Polytechnic and a Bachelor's degree in Creative Art/Psychology from Wilson College.  Susan is Myers-Briggs Type Indicator certified, PDI 360 PROFILOR certified and also holds certifications in Workforce Planning, Change Management and Labor Relations.


Joe McDonald serves as the Vice President of Talent Acquisition and leads the Cleared Staffing Solutions Group (Day & Zimmermann Federal Services). Mr. McDonald’s impactful contributions include establishing the talent acquisition organization, increasing mission effectiveness. Our dedicated recruiting teams support contracts for the Department of State, Defense, Energy and the Intelligence Community.

He joined Day & Zimmermann in 2010 serving as Vice President of Federal Services for Yoh Services LLC, where he built the new cleared staffing offering that became #3 in the market place within 18 months. Additionally, over the past 20+ years, Mr. McDonald served in a variety of operational and leadership positions in both the government and commercial sectors.

Mr. McDonald is a graduate of the United States Naval Academy with a Bachelor’s degree in Political Science. He served 21 years in the Marine Corps as both an Artillery Officer and an Intelligence Analyst. His foray into talent acquisition began while serving as Executive and Operations Officer for MCRS San Antonio, TX where he received four consecutive “Recruiting Station of the Year” awards.


Jeff Miller currently serves as Vice President of Operations & Maintenance (O&M). With more than a decade at SOC, Mr. Miller brings a substantial and broad range of operational, financial, business management, and leadership experience to the company. Prior to SOC, he held a number of key investment banking leadership positions with a focus on capital markets, strategic planning, and mergers and acquisitions. He advised on a number of high profile transactions in the industry, one of which was recognized by Washington Technology as a Big Impact Deal of the year.

Throughout his career, Mr. Miller has supported programs with the United States Departments of Defense, State, Energy, as well as other federal agencies in a broad range of service offerings both domestically and internationally.

Mr. Miller earned dual Bachelor of Science degrees in both Finance and Accounting from Georgetown University. He remains engaged with the University as an Interviewer for Georgetown’s Undergraduate Admissions Program. He was also a licensed General Securities Representative (Series 7 and 63).

Jerry Tiefenbrunn, Vice President of Business Development, manages the business portfolios of SOC and Government Services. In this position, he is responsible for growing the business and portfolio of contracts with the Department of Energy, Department of State, Department of Defense, and other federal government agencies.

Tiefenbrunn brings more than 20 years of experience delivering rapid growth and measurable, sustainable multimillion-dollar outcomes within information technology, operations & maintenance, defense, and other industries. In addition, he served our country with 20 years of service in the U.S. Army providing intelligence support to special missions around the world. He is certified as a Project Management Professional (PMP®) and has a Master of Science in Management with a Bachelor of Science in Management of Information Systems.

Tiefenbrunn’s team works collaboratively to ensure mission success and supports the ongoing company mission to be the most agile and trusted provider of mission support solutions to government customers operating in complex environments. In addition to working across Day & Zimmermann’s Government Services division, his team leverages the expansive talent and expertise from the family of companies within Day & Zimmermann.