A part-time George Washington University professor was listed in critical condition Wednesday after he was beaten during an attack in the Dupont Circle area over the weekend, D.C. police and university officials said.

Jason Chambers, a part-time faculty member at GWU’s school of public health and health services, was assaulted about 4 a.m. Sunday near the intersection of Connecticut Avenue and S Street NW, in the heart of one of the city’s busiest night spots.

Officers found Chambers, 39, “silent and almost motionless” on a sidewalk, according to a police report. It was not clear what led to the attack, but witnesses told police that a male assailant beat the victim and then fled.

Chambers was “unable to communicate and provide details of the assault” to investigators, the police report said. He was taken to a hospital.

A university spokeswoman said Chambers teaches in the department of Exercise Science, which includes teaching healthy eating and living a healthy lifestyle.