King County sheriff's Sergeant Kevin Fagerstrom says the man was jailed for investigation of criminal trespass and reckless endangerment.
Fagerstrom didn't release the man's name, but the King County Jail says James B. Wade was booked on those charges and released after posting $750 on a bail bond.
James B. Wade is an associate professor of Management and Human Resources at the University of Wisconsin. The personal interests section of his Web page shows base jumping photos.
The professor was one of three parachutists who launched themselves from 300 feet up a radio tower north of Seattle, but the professor got snagged on a wire. He remained suspended about 150 feet in the air for more than two hours before he was freed.
Shoreline Sergeant Kevin Fagerstrom says it was a "bonehead stunt'' that put the lives of fire department rescuers at risk.
One firefighter had to climb the tower, then slide down the wire to lower the professor to the ground.