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Leadership
Edward “Butch” M. Twining, Jr.
Chairman Emeritus
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Robert M. Ryan, CWI-QC1, ASNT Level III
Chief Executive Officer
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Linas Vitkus, PE, GE
President & Chief Operating Officer
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Boris Stein, DSc
Senior Vice President & CEO Concrete Insight
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Robert Hathaway
Chief Financial Officer
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Steven Schiffer
Senior Vice President, Client Services
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Mariel Attento-Rhorer
Vice President, Client Development
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Amy M. Owens, SPHR
Vice President, Human Resources
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Sam Sajed
Vice President, Long Beach Operations
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Paul C. Soltis, PE, GE
Vice President, Geotechnical Operations
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Sammy Daghighi, PE
Vice President, San Diego, Inland Empire, Northern California
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Technical Experts
Jon Browning, PG, CEG
Engineering Geology
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Liangcai He
Chief Geotechnical Engineer
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Yiwen Bu, PhD, PE, LEED AP
Concrete & AER
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Amir Ghavibazoo
Pavement Engineering & Asphalt Technology
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Meredith Strow
Petrographer
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Shawn Tibbits
Director of Inspections
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Andrew Falkenburg
Laboratory Manager Testing & Materials Evaluation
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Randy Saunders
Vice President, Modular Structures
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