Mr. Tonkin was born and raised in northern California. He graduated from the University of California Davis in 2000.  Mr. Tonkin attended law school at the University of the Pacific – McGeorge School of Law.  Mr. Tonkin focused on trial advocacy while at McGeorge.  He was regularly on the Dean’s List and graduated near the top of his class.  Mr. Tonkin was both a writer and editor for the McGeorge Law Review. While in law school, Mr. Tonkin competed on the mock trial team for McGeorge which was voted the best in the United States west of the Mississippi his graduation year.  He was also awarded top advocate honors in the nation’s premier mock trial competition, was inducted in the National Order of Barristers and received the Lewis F. Powell Medal for Excellence in Advocacy.

Mr. Tonkin and Mr. Arthofer formed the Arthofer & Tonkin Law Offices on May 1, 2009.  Mr. Mr. Tonkin’s practice focuses on trial advocacy.  He represents a range of clients, including those who have suffered the most drastic injuries as well as those with more modest claims but are still in need of excellent representation.  Additionally, Mr. Tonkin's clients include some of the nation's largest companies, governmental entities, as well as individuals and local businesses.  He has handled multimillion dollar wrongful death, premises liability, products liability, and claims involving public entities.   Mr. Tonkin has handled complicated property loss cases including wild land fires and major flood loss actions with damages in the tens of millions of dollars.

Mr. Tonkin has obtained very favorable results for his clients through the use of vigorous advocacy in the litigation process.  Mr. Tonkin is admitted to practice before all of the courts of the State of California as well as the Eastern and Northern Federal District Courts in California.

In his time away from the office, Mr. Tonkin enjoys time with his family, fitness activities ranging from running to boxing and mountain biking to Brazilian Jiu Jitsu.  He also enjoys a wide range of outdoor activities and shooting sports.