President & Chief Executive Officer
Tim Ruben joined USSI in 1994, and 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.
Senior Vice President, Operations
Efrain Estrada joined USSI in January 2008 and oversees
operations for USSI. With over 25 years
of experience in the service sector, Efrain is responsible for
managing customer and employee relations, operations personnel and
ensuring efficient service delivery. 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
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, Vice President Business
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. In her role as Vice
President of Business Development, Danna is responsible for revenue
growth, process improvement, sales strategy and implementation, and
team development. Danna has over 15 years of strategic human
resources and business development experience and holds a Bachelor
of Science in Marketing from George Mason University.