People & Culture


Management Team






Markets We Serve














Tim Ruben
President & Chief Executive Officer

Tim Ruben
Tim Ruben joined USSI in 1994, and now serves as President and CEO. Before stepping up to his current position, he was Senior Vice President of Marketing and Business Development. Previous to his time at USSI, Tim worked 14 years for IBM as a Business Unit Executive; he received a BA in Economics from Rice University, and an MBA in Quantitative Analysis from the University of Wisconsin, Madison.



Joel Felrice
Senior Vice President

Joel Felrice

Joel Felrice has worked for USSI since 1974, and is now Senior Vice President. Joel is responsible for all financial-related activities, accounting, purchasing, and administration. Before working with USSI, Joel was a CPA with Arthur Young and Company; he received a BBA and MBA from Pace University.



Efrain Estrada

Vice President, Operations, Washington-Baltimore Region

Efrain Estrada
Efrain Estrada joined USSI in January 2008 and oversees regional operations for the Washington-Baltimore region. With over 17 years of experience in the service sector, Efrain is responsible for managing customer and employee relations, operations personnel and ensuring efficient service delivery for the region. Prior to joining USSI, Efrain worked in various managerial positions for A&L Service Industries and UNICCO. Efrain attended the Universidad Nacional De El Salvador in San Salvador, El Salvador.



Stephanie D. Nester


Stephanie Nester
Stephanie Nester joined USSI in July 1996. In her role as CFO, Stephanie oversees payroll, accounts receivable, accounts payable and purchasing departments and is responsible for producing timely and accurate financial statements, as well as protecting USSI’s assets. Stephanie graduated from Virginia Polytechnic Institute and State University, and is an active CPA licensed by the State of Maryland. She is also an active member of the American Institute of Certified Public Accountants (AICPA).




Danna Hewick, SPHR

Vice President, Human Resources


Danna Hewick joined USSI in July 2013.  In her role as Vice President, Human Resources, Danna oversees performance management, training and development, policy and procedure, recruiting and employment practices for both union and non-union staff.  A certified Senior Professional in Human Resources (SPHR), Danna has over 15 years of strategic human resources experience. Prior to joining USSI, Danna was Director of Administration, managing human resources, facility, information technology and administration for a manufacturing company.   Danna holds a Bachelor of Science in Marketing from George Mason University. She is a member of the National Society of Human Resources and the Montgomery County Society of Human Resources.



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