Shannon is the managing partner of the firm’s San Francisco office and leads the firm’s California environmental practice.  Her prior experience as a chemical engineer in the oil and gas industry affords her unparalleled insights into the development of regulations and counsel on environmental, health and safety issues. Shannon also maintains an office in Washington, DC. Splitting her time between these offices allows her to help her clients wherever they may be. Shannon’s work focuses on permitting, enforcement, environmental incident response, and regulatory advocacy and litigation.

A nationally recognized authority on Clean Air Act matters, with more than 25 years of experience addressing all aspects of the act, Shannon represents clients in a variety of manufacturing and energy sectors, including oil and gas, chemical, paper, automotive, power generation and utilities. Shannon also advises companies in preparation for and responding to environmental incidents and under federal and state process safety management and risk management plan regulations.

Highly regarded for her litigation practice challenging and defending EPA and California regulations and permits before federal and state appellate courts, in 2018, she was named to The National Law Journal’s list of “Energy & Environmental Trailblazers.” She is also lauded for her deep knowledge of environmental enforcement matters, and is respected by her Fortune 100 clients for her solid advice on compliance advocacy. She was previously an engineer for Chevron, USA, in Los Angeles, California.

Shannon is admitted in the Supreme Court of California; US District Court, Eastern District of California; and US Courts of Appeals for the District of Columbia, Ninth and Tenth Circuits.

Shannon is a contributor to the firm’s environmental blog, The Nickel Report.