A state senate committee and the senate president pro tem chose a San Francisco supervisor to replace Steve Kinsey on the California Coastal Commission, the 12-member entity that regulates development along 1,100 miles of shoreline. Aaron Peskin, who comes with a long background in environmental work, started his position yesterday at the commission’s meeting in Ventura, when he was sworn in. Before that meeting, he spent a day reviewing 800 pages of material. “I think it’s a good fit for me as an environmental advocate,” said Mr. Peskin, who will now represent coastline in Sonoma, Marin and San Francisco. In addition to serving on the San Francisco Board of Supervisors for nine years (his most recent term started in 2016, but he also served from 2001 to 2009), he has served on the San Francisco Bay Conservation and Development Commission, the Golden Gate Bridge Authority, the San Francisco Bay Restoration Authority and the city’s Sea-Level Rise Coordinating Committee. He’s also the president of a nonprofit, Great Basin Land and Water, that works on issues in the Great Basin area of California, Nevada and Utah. He has led the city’s Democratic Party Central Committee and advocated for limitations in San Francisco on evictions allowed under the state’s Ellis Act. He said he has not been involved in many coastal commission issues, as San Francisco only has a small portion of land under the commission’s jurisdiction, but he was part of an appeal that protested a soccer field proposal that involved installing artificial turf in Golden Gate Park. (The appeal was unsuccessful.) His appointment comes a month after the commission hired a new executive director: Jack Ainsworth, a 29-year commission employee who served as the interim executive director after commissioners fired their previous leader, Charles Lester, in a move that provoked ire in the environmental community. The replacement of Mr. Kinsey also comes as a key part of Marin’s Local Coastal Program related to environmental hazards is still pending commission approval; the section has stirred concerns in West Marin over how tightly it will constrain home development in some areas. Mr. Peskin said he sent an email to Supervisor Dennis Rodoni this week, “telling him that I want to meet at the Civic Center and sit down with him and other interested people in Marin County” about the county’s issues.