Gerald Singleton began his legal career as a trial attorney at Federal Defenders of San Diego in 2000, where he represented federal criminal defendants in the Southern District of California and before the Ninth Circuit Court of Appeals. He left Federal Defenders in 2003 to start his own practice, which has grown from a sole proprietorship into the national firm of Singleton Schreiber, LLP, with over 90 attorneys and 400 employees and over a dozen offices throughout the United States.

Mr. Singleton is one of the nation's leading experts in fire litigation. Over the past two decades, he and his team have represented over 30,000 fire victims in more than 30 wildfires in California, New Mexico, Oregon, Washington, Hawaii, Colorado and Texas, and have recovered over $3 billion on their behalf. He currently serves as court-appointed liaison counsel in the Eaton Fire case in Los Angeles and the Dixie Fire case in San Francisco. In 2020, Mr. Singleton was appointed by the U.S. Bankruptcy Court to serve on the Oversight Committee of the $13.5 billion Fire Victim Trust. He is the chair of the American Association of Justice's national wildfire litigation group and has lectured on fire litigation across the country.

Over the past several years, Mr. Singleton has expanded the firm's practice to include representing public entities and individuals in environmental and toxic tort litigation across the country. In 2023, he and his team brought the first medical-monitoring claim to address carcinogens and other dangerous toxins in wildfire smoke. In 2024, Singleton Schreiber partnered with the NAACP to bring litigation on behalf of thousands of women who developed cancer and/or uterine fibroids from exposure to endocrine disrupting chemicals in over-the-counter hair relaxer products.