A man who allegedly posed as a West Los Angeles fertility doctor using the identity of an actual physician has been charged with sexually assaulting two men in Marina del Rey and Santa Monica, authorities said.

Police arrested Jeffrey Lynn Graybill, 40, who is suspected of posing as “Dr. Robert Richardson,” at his Phoenix home September 30th, said Los Angeles Police Department officer Justin Malcuit of the Sexual Assault Detail. Graybill, who police say has no medical training, had allegedly acted as a fertility doctor at a West Los Angeles clinic and used the Internet to solicit patients.

The Los Angeles County District Attorney’s Office has filed 11 counts against Graybill, including practicing medicine without a certificate, identity theft, sexual battery by fraud and sexual penetration with a foreign object, district attorney spokeswoman Jane Robison said.

Graybill pleaded not guilty to the charges at an arraignment hearing Thursday, October 1st. He is being held on $590,000 bail, Robison said.

Graybill is accused of posting advertisements on Craigslist and attempting to solicit male clients by offering them up to $4,000 monthly for sperm donations in support of “stem cell and other research,” police said. He allegedly communicated with prospective victims, typically college-age men, by telephone or email before meeting with them to conduct physical examinations at apartments in Marina del Rey and Santa Monica, Malcuit said.

Los Angeles police began the investigation after two men reported incidents in early summer, Malcuit said. None of the alleged clients were paid by Graybill, the officer said.

Officers believe there are additional victims in the Los Angeles area and Arizona who have not yet come forward.

Graybill is scheduled to appear at the Los Angeles Superior Court Airport Courthouse for a preliminary hearing Friday, October 16th.

Anyone with information or who believes they may be a victim of this case is encouraged to contact the LAPD West Bureau Sexual Assault Detail at (213) 473-0404.