Meet our Executive Team

Experienced leadership bringing decades of technology and industry expertise

Executive Officers

Jeff Quiram

President, Chief Executive Officer, Board Member
Jeffrey A. Quiram has served on our Board, and has been our President and Chief Executive Officer, since 2005. From 1991 to 2004, Mr. Quiram served ADC Telecommunications in a variety of management roles, including Vice President of its wireless business unit. Mr. Quiram has a B.S. in Quantitative Methods and Computer Science from College of St. Thomas, and an M.B.A. from University of Minnesota. Our Board has determined that Mr. Quiram is qualified to serve as a director because he has extensive knowledge about product development, business planning, and complex manufacturing. In addition, he has extensive knowledge about our corporate operations and market activities from serving as our Chief Executive Officer.
Bill Buchanan

Vice President, Chief Financial Officer
William J. Buchanan has been our Chief Financial Officer since May 2010. Mr. Buchanan joined us in 1998 and served as our Controller from 2000 to May 2010. For 16 years prior to joining us, he was a self-employed private investor and investment advisor. For the nine years prior to that, he served in various executive and accounting positions with Applied Magnetics Corp and Raytheon Co. Mr. Buchanan holds a B.A. in Economics from California State University, Fresno.
Robert L. Johnson

Senior Vice President, Operations
Robert L. Johnson has been our Senior Vice President, Operations since 2004. Mr. Johnson joined us in 2000 as Vice President of Wireless Manufacturing. From 1996 to 2000, Mr. Johnson was the Director and General Manager of Schlumberger ATE. From 1990 to 1996, he served as Vice President and General Manager of Harman International Industries. Mr. Johnson studied industrial engineering at Arizona State University.
Adam Shelton

Vice President, Marketing and Product Management
Adam L. Shelton has been our Vice President, Product Management and Marketing since 2006. From 2005 to 2006, Mr. Shelton was the Senior Director of Marketing for Motorola. From 2003 to 2005, he was the Senior Director of Marketing for Advanced Fibre Communications (AFC), now Tellabs. Mr. Shelton also held various management and executive management positions with Mahi Networks, ATU Communications and Bell Canada. Mr. Shelton graduated with dean’s honors as a Civil Engineering Technologist from Seneca College in Toronto, Canada.
Ken Pfeiffer

Vice President, Engineering
Kenneth E. Pfeiffer has been our Vice President, Engineering since 2012. From 2009 to 2011, Mr. Pfeiffer was Vice President, Engineering at Veeco Instruments Inc. From 2006 to 2009, Mr. Pfeiffer was the Director of Equipment Engineering for HelioVolt Corporation. Prior to that, Mr. Pfeiffer held various engineering and management positions at Active Power, Inc. and Applied Materials, Inc. Mr. Pfeiffer obtained a B.S. Mechanical Engineering degree from Texas A&M University in 1990 and a M.S. Mechanical Engineering from the University of Texas in 1994. He also holds a Master’s in Business Administration degree from the University of Texas at Austin.

Board of Directors

Lynn J. Davis

Board Member, Chairman of the Compensation Committee
Lynn J. Davis has served on our Board since 2005. He served as President, Chief Operating Officer and director of August Technology, a manufacturer of inspection equipment for the semiconductor fabrication industry from 2005 to 2006. From 2002 to 2004, he was a partner at Tate Capital Partners Fund, LLC, a private investment firm he co-founded. Prior to Tate, Mr. Davis was an employee of ADC Telecommunications for 28 years, serving in 14 management positions, including Corporate President, Group President and Chief Operating Officer. In December 2016, he retired as Chairman of the Board of Directors of Flexsteel Industries Inc., a furniture manufacturer. Mr. Davis holds a B.S. in electrical engineering from Iowa State University and an M.B.A. from the University of Minnesota. Our Board has determined that Mr. Davis is qualified to serve as a director because he has extensive knowledge in various management roles in the telecommunications industry, including manufacturing, sales and marketing. In addition, as a venture capitalist, Mr. Davis has worked with smaller companies and brings a valuable entrepreneurial approach to management and compensation issues.
David Vellequette

Board Member, Chairman of the Audit Committee, Financial Expert
Mr. Vellequette rejoined STI’s Board of Directors in December 2017. He previously served on STI’s board from 2007 to 2014. Mr. Vellequette most recently served as Senior Vice President of Finance of Avaya, a global provider of business collaboration and communications solutions. From October 1, 2012 through October 23, 2017, he was Avaya’s senior vice president, chief financial officer. In this role, he was responsible for the overall financial governance and management of Avaya's financial operations, including overall responsibility for the Controller’s organization, financial planning, Treasury, Tax and IT. Between 2012 and 2004, he was at JDSU, where he served as chief financial officer from June of 2005 to October 2012. As CFO of JDSU, Mr. Vellequette played an integral role in improving the company’s profitability metrics through an extensive program of cost reductions. During his tenure, and in support of JDSU’s strategic objective to diversify its revenue, both organic growth and acquisitions contributed to annual revenue growth of more than 70 percent. He joined JDSU as vice president and operations controller in July 2004. Prior to joining JDSU, Mr. Vellequette was vice president of worldwide sales and service operations at Openwave Systems. Between 1992 and 2002, Mr. Vellequette held increasingly responsible positions at Cisco Systems, first as corporate controller of StrataCom Corporation (acquired by Cisco in 1996) and later as vice president of finance supporting the multi-billion dollar service provider line of business. From 1984 to 1992, Mr. Vellequette was corporate controller at Altera Corporation. Mr. Vellequette started his finance career as an auditor with Ernst and Young. He holds a B.S. in Accounting from the University of California, Berkeley, and is a CPA.
Julie Johnson

Board Member
Ms. Johnson joined STI’s Board of Directors on October 17, 2018. Since November 2017, Ms. Johnson has served on theBoard of Directors of Lumentum Holdings Inc. (NASDAQ: LITE), a provider of optical and photonic products addressing a range of end market applications including data communications and telecommunications networking and commercial lasers for manufacturing, inspection and life-science applications. Having over 25 years of product management, product development, and technology experience, from March 2017 to August 2018, Ms. Johnson was Senior Vice President Product Management at VeriFone, a global provider of technology that enables electronic payment transactions. From 2014 to 2016, Ms. Johnson was Corporate Vice President Product Management at Lenovo Group Ltd. , a Chinese multinational technology company selling personal computers, tablet computers, smartphones, amongst others. Prior to Lenovo, Ms. Johnson had been Corporate Vice President - Product Management at Google from 2012 to 2014, and Vice President of Product Management at Motorola Inc.. Ms. Johnson holds both an M.B.A and M.S. in Materials Science and Engineering from the Massachusetts Institute of Technology, and a B.S. in Math and Physics from Albion College.
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