A former William Mitchell College of Law adjunct professor has been barred from practicing law for at least 90 days for sexually harassing a student he was advising.

Clark Calvin Griffith, 70, was fined and sentenced to probation last year in Ramsey County District Court after a plea deal in which he was found guilty of exposing himself to the student and placing her hand on his crotch.

That incident followed a dinner in which he made sexually charged comments toward the student. Afterward, Griffith contacted the student against her wishes and tried to persuade her to drop the complaint.

The student was meeting with Griffith, a sports law attorney and the son of former Minnesota Twins owner Calvin Griffith, because he was supervising an independent clinic she was taking through the college.

He resigned from the law school shortly after the incident. As part of his plea agreement, the case was dismissed after a year.

The Minnesota Supreme Court imposed the suspension Tuesday after a petition of the Office of Lawyers Professional Responsibility, which monitors lawyers’ conduct in Minnesota.

The suspension is effective Nov. 19, and Griffith will have to apply for reinstatement afterward.

One Supreme Court justice, David Lillehaug, dissented, saying the suspension was too short; he said Griffith should be suspended for at least six months.

Griffith spent 18 years in the Twins’ front office as treasurer and executive vice president under his father, the former Senators owner who relocated the club from Washington, D.C., in 1961.

Emily Gurnon contributed to this story. Marino Eccher can be reached at 651-228-5421. Follow him at twitter.com/marinoeccher.