Bubar runs a litigation, business and communications law practice. Jim previously worked at Kaye Scholer (now Arnold & Porter) and was Special Assistant US Attorney. He is admitted to practice law in California, Maryland and the District of Columbia.

Bubar served five terms as co-chair and was a member of the Steering Committee of the DC Bar Affairs Community. The DC Bar awarded him "Lawyer of the Year" in 2024. Jim currently serves on the Communities Committee of the DC Bar and is a member of the Federal Communications Bar Association. He served on the Board of Governors of University of California Hastings College of Law (now UC Law) Alumni where the Democratic Nominee also attended.

He is a triathlete and coaches triathlon at the Anthony Bowen YMCA. He was also a DC Babe Ruth baseball commissioner.Websites for Community Access TV in the United States