Sprenger is best known as lead counsel of Jenson v. Eveleth Taconite Co., a discrimination case involving female iron miners in Minnesota.
Finding himself unsatisfied with representing business clients, Sprenger began his own firm in 1977, with a primary focus on employment discrimination class actions.
In Minneapolis in August 1988, Sprenger filed Lois E. Jenson and Patricia S. Kosmach v. Eveleth Taconite Co. in U.S. District Court[2] The case, known as Jenson v. Eveleth Taconite Co., became the first sexual harassment discrimination class action lawsuit in the U.S. [citation needed] A fictionalized account of the landmark case was made into a 2005 film, North Country, with Woody Harrelson portraying the lead attorney "Bill White," acting in the Paul Sprenger role.
The case involved claims of widespread age discrimination in the television production and talent agency industries.
[4][5][6] Sprenger was the treasurer of the Tregaron Conservancy, an environmental non-profit organization that restores and maintains the Tregaron historic estate in Washington, D.C. Sprenger served on the board of directors of the Atlas Performing Arts Center and served as the Treasurer of the organization.