Jon Welner
Overview
Jon Welner is a partner in Crowell & Moring’s San Francisco office. He brings more than 25 years of experience addressing environmental regulatory challenges and resolving land development disputes for businesses and local governments in California.
Career & Education
- California Natural Resources Agency
Special Assistant to the Secretary - Town of Tiburon
Mayor, 2021–22 & 2025–Present
Councilmember, 2018–Present
- California Natural Resources Agency
- Stanford Law School, J.D., 1995
- Stanford University, B.A., with distinction, Phi Beta Kappa, 1989
- California
- U.S. District Court for the Northern District of California
- U.S. District Court for the Eastern District of California
- U.S. District Court for the Central District of California
- U.S. District Court for the Southern District of California
- U.S. Court of Appeals for the Ninth Circuit
- Judicial Clerk for Honorable Samuel Conti, U.S. District Court for the Northern District of California
Professional Activities and Memberships
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Mayor and Councilmember, Town of Tiburon
- Former Board Member and President, Osher Marin Jewish Community Center
- Executive Committee member and former Chair, Environmental Law Section, Bar Association of San Francisco
- Advisory Board member, Environmental Law Section, California Lawyers Association (formerly the California State Bar)
- Board of Directors, John Gardner Fellowship Association
- Advisory Board, Stanford-in-Government
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Jon's Insights
Client Alert | 7 min read | 12.17.25
After hosting a series of workshops and issuing multiple rounds of materials, including enforcement notices, checklists, templates, and other guidance, the California Air Resources Board (CARB) has proposed regulations to implement the Climate Corporate Data Accountability Act (SB 253) and the Climate-Related Financial Risk Act (SB 261) (both as amended by SB 219), which require large U.S.-based businesses operating in California to disclose greenhouse gas (GHG) emissions and climate-related risks. CARB also published a Notice of Public Hearing and an Initial Statement of Reasons along with the proposed regulations. While CARB’s final rules were statutorily required to be promulgated by July 1, 2025, these are still just proposals. CARB’s proposed rules largely track earlier guidance regarding how CARB intends to define compliance obligations, exemptions, and key deadlines, and establish fee programs to fund regulatory operations.
Event | 11.04.25
Speaking Engagement | 11.04.25
Speaking Engagement | 11.04.25
"Hot Takes from the Experts," Pioneering Environmental Law in the Space Industry
Recognition
- Best Lawyers in America, Environmental Law; Litigation — Environmental; Natural Resources Law; Real Estate Law, 2016–2026
Jon's Insights
Client Alert | 7 min read | 12.17.25
After hosting a series of workshops and issuing multiple rounds of materials, including enforcement notices, checklists, templates, and other guidance, the California Air Resources Board (CARB) has proposed regulations to implement the Climate Corporate Data Accountability Act (SB 253) and the Climate-Related Financial Risk Act (SB 261) (both as amended by SB 219), which require large U.S.-based businesses operating in California to disclose greenhouse gas (GHG) emissions and climate-related risks. CARB also published a Notice of Public Hearing and an Initial Statement of Reasons along with the proposed regulations. While CARB’s final rules were statutorily required to be promulgated by July 1, 2025, these are still just proposals. CARB’s proposed rules largely track earlier guidance regarding how CARB intends to define compliance obligations, exemptions, and key deadlines, and establish fee programs to fund regulatory operations.
Event | 11.04.25
Speaking Engagement | 11.04.25
Speaking Engagement | 11.04.25
"Hot Takes from the Experts," Pioneering Environmental Law in the Space Industry
Insights
Oak Park Banned Natural Gas In New Buildings, But A Legal Fight Is Underway
|08.01.25
Chicago Sun-Times
- |
07.09.25
Crowell & Moring’s Retail & Consumer Products Law Observer
Jon's Insights
Client Alert | 7 min read | 12.17.25
After hosting a series of workshops and issuing multiple rounds of materials, including enforcement notices, checklists, templates, and other guidance, the California Air Resources Board (CARB) has proposed regulations to implement the Climate Corporate Data Accountability Act (SB 253) and the Climate-Related Financial Risk Act (SB 261) (both as amended by SB 219), which require large U.S.-based businesses operating in California to disclose greenhouse gas (GHG) emissions and climate-related risks. CARB also published a Notice of Public Hearing and an Initial Statement of Reasons along with the proposed regulations. While CARB’s final rules were statutorily required to be promulgated by July 1, 2025, these are still just proposals. CARB’s proposed rules largely track earlier guidance regarding how CARB intends to define compliance obligations, exemptions, and key deadlines, and establish fee programs to fund regulatory operations.
Event | 11.04.25
Speaking Engagement | 11.04.25
Speaking Engagement | 11.04.25
"Hot Takes from the Experts," Pioneering Environmental Law in the Space Industry
