Photo of James E. McMahon

James is a lawyer at Redstone Law Firm and is in the Civil Litigation practice group where he represents individuals and businesses in a variety of subjects. He is of counsel to Redstone Law Firm.




Primary Practice Group:  Civil Litigation

James' Professional Background:

  • Law degree from University of South Dakota in 1977.
  • B.S. degree from Morningside College in 1973.
  • 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

Honors and Awards:

  • South Dakota Trial Lawyer of the Year, 2000
  • South Dakota Recipient of The Eight Circuit Bar Association Richard S. Arnold Award for Distinguished Service and Lifetime Achievement, 2012

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 (Past Board Member)