About Anderson Zeigler

Anderson Zeigler can trace its roots to some of Sonoma County’s oldest and most prestigious law firms.

We are proud to represent many of the first businesses and founding families in Northern California, while at the same time forging relationships with the next generation of those families, and with entrepreneurs in new industries and businesses.

We have done that with a culture that values attorneys who are smart, creative, and hardworking. We strive to create a working relationship with our client that provides dependable, responsive, efficient and effective legal work. Our practice areas reflect the needs of our clients and the attorneys at Anderson Zeigler work together both within and across practice areas to meet client needs.

The attorneys and staff of Anderson Zeigler not only serve their clients, but give back to the community by being involved as leaders in numerous community organizations- from professional associations to cultural, civic and educational organizations.


Edwin C. Anderson Jr. (retired), Kirt Zeigler, and Robert Disharoon (retired) founded the firm in 1982. Each was a member of the Spridgen, Barrett, Achor & Luckhardt, Anderson, James & Zeigler law firm which was the oldest law firm in Santa Rosa at the time. Until his retirement in 2015, Mr. Anderson’s practice was focused on estate planning and administration practice, and he advised a host of clients on all manner of complex estate and tax matters. He gained a reputation as one of Sonoma County’s preeminent attorneys and was honored by the Sonoma County Bar Associate Careers of Distinction Award Recipient in 2003. One of his proudest achievements was helping Christo and Jean-Claude bring The Running Fence to Sonoma and Marin Counties in 1976. He was also the attorney for Charles M. Schulz of Peanuts fame.

Mr. Disharoon’s practice covered a broad range of estate planning, trust administration and business matters. During his tenure at AZ, Mr. Disharoon represented many of the prominent businesses and people in Sonoma County. He highlights of his client list spans the variety of Sonoma County industries: ranchers and farmers, wineries, hospitality, hardware and grocery store owners, manufacturers, publishers, nonprofits, professionals and real estate investors. Mr. Disharoon retired in 2016.

AZ Community Day at the Redwood Empire Food Bank

AZ Community Day at the Redwood Empire Food Bank


Administrative Leaders

Marianne Leyva joined AZ in December of 2018. She assists Managing Directors, Wendy Whitson and Donald Black, in overseeing the administrative and business operations of the firm.

AZ was proud to be recognized as a “Best Places to Work” by the North Bay Business Journal in 2017.