Mark Weideman

Mark Weideman

Weideman has decades of experience representing some of the nation’s most sophisticated and politically powerful clients. He provides strategic advice and counsel to his clients designed to achieve their objectives before government entities and acts as their chief advocate before legislative, regulatory and administrative bodies. Weideman has been the architect of successful procurements that have landed clients billion dollar and multi-million dollar contracts. He designs grassroots campaigns that provide broad organic support for policy initiatives and he coordinates activity in local, state and national elections.

Weideman has served as an officer of Blue Shield of California and AT&T of California, with responsibility for legislative, regulatory, legal and political activities in California and Washington D.C. He has practiced law with the international law firm Pillsbury and with the Sacramento firm Wilke Fleury.

Weideman received his Bachelor of Arts degree with honors from the University of California at Berkeley. He earned his law degree with honors in written and oral advocacy from the University of California Hastings College of Law. He is a registered lobbyist with the State of California and a licensed attorney with the State Bar of California.

Tim Valderrama
Ryan McCarthy

Ryan McCarthy
Director of Climate and Clean Energy

McCarthy has been a leader at the forefront of climate, energy, technology and transportation policy in California for nearly 20 years. He leads Weideman Group's growing climate and clean energy practice, where clients benefit from his deep analytical, regulatory and legislative expertise.

McCarthy spent over eight years in the Administrations of Governors Jerry Brown and Gavin Newsom, serving as the Science and Technology Policy Advisor to the Chair of the California Air Resources Board. At CARB, he was instrumental in developing many of the state's leading climate policies, including its 2030 and climate neutrality targets, short-lived climate pollutant strategy, and clean energy and transportation policies. McCarthy has worked extensively with the principals and staff at California's energy, environmental, resource, and transportation agencies, along with leaders in local, state, provincial, and national governments throughout the world.

Prior to CARB, McCarthy helped launch the California Plug-In Electric Vehicle Collaborative and worked in the California Legislature. He received a BS in structural engineering from UC San Diego and an MS and PhD in transportation engineering from UC Davis. McCarthy is a registered lobbyist with the State of California.

Alejandra Durán
Vincent Valderrama

Vincent Wiraatmadja

Wiraatmadja is a registered lobbyist for Weideman Group. He provides direct lobbying, strategic counsel, legislative tracking, regulatory monitoring and procurement services for the firm’s clients. Wiraatmadja previously worked in the California State Legislature and on legislative campaigns. He also clerked for an administrative law judge and worked in the legal division of the State Treasurer’s Office. Wiraatmadja received his bachelor’s degree from the University of California, Irvine, and his law degree with the Capitol Certificate in Public Policy from the University of Pacific, McGeorge School of Law.

Bethany Heckman
Chris Valencia

Chris Valencia
Legislative Aide

Valencia tracks legislation and regulatory matters for clients, ensures timeliness of submissions with government entities and supports the firm’s advocacy efforts. He previously worked for Governor Edmund G. Brown Jr. in the Governor’s Appointments Unit. Valencia also worked in the State Legislature and on political campaigns. He received his bachelors degree in political science from the University of California, Davis.