Justice Eismann was raised in Owyhee County and graduated in 1965 from Vallivue High School near Caldwell, Idaho. He enrolled at the University of Idaho, and in 1967, he left the University to enlist in the UnitedStates Army. He served two consecutive tours of duty in Vietnam where, as a crew chief/door gunner on a Huey gunship, he was awarded two purple hearts for being wounded in combat and three medals for heroism.
After being honorably discharged from the military, he returned to the University of Idaho where he received his undergraduate degree and then graduated cum laude from law school in 1976. After practicing law for ten years, Justice Eismann was appointed as the Magistrate Judge in Owyhee County. As a magistrate judge, he was a member of the Region III Council for Children and Youth; he helped create Childrens Voices, Inc., an organization to recruit, train and oversee guardians ad litem to represent the interests of neglected and abused children in court proceedings; he organized and served upon a community diversion board to handle outside the judicial system first-time juvenile offenders who committed minor crimes; and he chaired the Canyon County Juvenile Justice Task Force.
In 1995, Governor Batt appointed Justice Eismann as a district judge in Ada County. Convinced that there must be a more effective way to deal with the burgeoning drug problem, Justice Eismann began working to set up a drug court in Ada County. In 1998, Ada County was awarded a federal grant, and in February 1999, the drug court began receiving participants. Justice Eismann presided over that drug court until just prior to taking office as a Justice of the Idaho Supreme Court. The Ada County Drug Court is proving effective in getting addicts off drugs so that they can restore their lives, rebuild their family relationships, and become productive members of the community. In 1998, the other district judges elected Justice Eismann as the Administrative District Judge for the Fourth Judicial District, consisting of Ada, Boise, Elmore, and Valley Counties. While a district judge, he also served on the Ada County Domestic Violence Task Force.
In 2000, the people of Idaho elected Justice Eismann to the Idaho Supreme Court, where he began serving on January 2, 2001. He also serves as chair of the statewide Drug Court and Mental Health Court Coordinating Committee, and has served on and chaired various other Supreme Court committees. He is a member and past-president of the Boise Chapter of the Inns of Court and currently serves on the boards of the Idaho State Bar Lawyers Assistance Program, which provides assistance to lawyers with substance abuse or mental health problems, and of the Idaho Law Foundation. He also served as co-chair of Idaho Partners Against Domestic Violence, on the board of directors of the Conference of Chief Justices, and on the Idaho Criminal Justice Commission. Justice Eismann served as Chief Justice of the Idaho Supreme Court from August 1, 2007, to July 31, 2011. In 2009, he was inducted into the National Association of Drug Court Professionals Stanley M. Goldstein Hall of Fame.
In 1982, Justice Eismann married Sheila Wood, and they have three adult children.