James M. Mucklestone is the son of John P. Mucklestone and Patricia J. Mucklestone, who founded the law firm of Mucklestone & Mucklestone in 1956, in downtown Seattle. This followed the family footsteps of
     Milo Mucklestone, (Great Uncle), a district attorney and judge in Wisconsin in 1910,
     Mel Mucklestone, (Great Uncle), an attorney in Chicago, Illinois, in 1920,
     Robert Mucklestone, (Uncle Bob), a partner with Seattle law firm Perkins Coie, and
     Peter Mucklestone, (Cousin Pete), a partner with Seattle law firm Davis Wright Tremaine.
James went through law school with his brother, John Patrick and sister, Jeannie, who graduated six month after James entered.

From 1989 until 1991, James worked with the Seattle City Attorney's office as a prosecutor. There is no substitute for trial experience and James got plenty. More than one hundred jury trials were prosecuted by James personally, as well as arguing in the second highest court in the state, the Court of Appeals, when he was 22. Father John, brother John, sister Jeannie, and James were at Mucklestone & Mucklestone from 1991 until 1998 when James moved to Arlington and opened his own office on September 1, 1998. James has served a Judge Pro Tem in Snohomish County District Court and for the Cities of Arlington, Lake Stevens and Marysville. Seattle University Law School also has James sit as a Judge for student argument presentations.

James limits his practice to defending traffic matters, both civil and criminal.