Photo of James E. McMahon

Jim is a partner at Redstone Law Firm and is the team lead for the Civil Litigation practice group where he represents individuals and businesses in a variety of subjects.

Primary Practice Group:  Civil Litigation



Jim’s Professional Background:

  • Morningside College B.S. 1973
  • University of South Dakota J.D. 1977
  • Assistant Attorney General 1978-1981
  • Boyce, Murphy, McDowell & Greenfield, Sioux Falls, SD 1981-2001
  • United States Attorney for the District of South Dakota 2002-2005
  • Presently, Redstone Law Firm, LLP, Sioux Falls, SD


  • South Dakota Bar
  • U.S. District Court, District of South Dakota
  • U.S. Court of Appeals, 8th Circuit


  • South Dakota Trial Lawyer of the Year, 2000

Legal Associations:

  • South Dakota Trial Lawyers Association
  • American Board of Trial Advocates (ABOTA), South Dakota President 2001-2002
  • American College of Trial Lawyers
  • Second Judicial Circuit Bar Association
  • State Bar of South Dakota

Other Associations

  • Ronald McDonald House, Sioux Falls, SD (Past Board Member)
  • Avera McKennan Hospital (Past Board Member)
  • South Dakota Game, Fish & Parks (Past Commissioner)
  • South Dakota Humanities Counsel (Current Board Member)