Viswanathan

June 22, 2026

SCS Engineers announces two leadership changes in its Southwest solid waste and engineering divisions. The firm promotes Eric Sonsthagen, P.E., to Project Director and Engineering Lead. After a transition period from Srividhya (Vidhya) Viswanathan, P.E., to Eric, Vidhya will lead the solid waste group.

As part of the Southwestern Business Unit’s broader leadership plan, SCS Engineers will transition several senior roles over the next 18 months to support the next generation of company leaders. Senior Vice President Patrick S. Sullivan, REPA, CPP, BCES, said the company designed these transitions to position SCS and its clients for continued growth and long-term success.

Eric Sonsthagen brings two decades of experience leading environmental and solid waste projects for public and private clients. He designs, reviews, and permits solid waste facilities; oversees landfill gas control and mitigation systems; modifies gas collection and control systems; and manages landfill cell construction and closure projects.

As Project Director and Engineering Lead, Sonsthagen will work across SCS’s specialty business divisions, drive project execution, strengthen the engineering division, and advance strategic priorities. He adds deep expertise in landfill gas engineering and modeling, beneficial reuse evaluations, air permitting, emissions inventories, compliance evaluations, and environmental investigations.

Vidhya Viswanathan currently serves as Senior Vice President and Director of Engineering for SCS Engineers’ Southwest region and will assume leadership of the solid waste group. She has more than two decades of experience in solid waste management, landfill gas engineering, and compost facility design. She is a licensed Professional Engineer in California, Arizona, Nevada, and Oklahoma and is based in San Diego, CA.

“These are important leadership transitions for the next generation of SCS leaders and to assure continued quality delivery for our clients,” Sullivan said.

Eric and Vidhya are both available by contacting SCS Engineers and on LinkedIn.

 

 

 

 

 

Posted by Diane Samuels at 6:00 am
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