Landis, a 38-year-old San Francisco resident, was arrested last week after investigators allege that he invited over several current and former students from SFSU and University of San Francisco for a party and secretly filmed them while they used the bathroom.
The investigation began in November after a student at one of his parties discovered the camera hidden underneath a tissue box on top of the toilet.
The student removed the memory card in the camera and examined the contents later at his own home and turned it over to investigators.
Landis is currently out of custody on $100,000 bail and was not present at the arraignment.
Landis’ lawyer entered the not-guilty plea to 15 misdemeanor charges, Assistant District Attorney Alex Bastian said. A status update hearing in the case is scheduled for Sept. 9.