A Claremont, New Hampshire, orthopedic surgeon appeared in court Wednesday on allegations that he sexually assaulting a patient during an office visit.

Dr. Thomas Marks, 70, of Newbury is an orthopedic surgeon at Valley Regional Hospital was arrested Tuesday at his office in Claremont. Police opened an investigation in December after a woman reported he sexually assaulted her.

Claremont Police Chief Brent Wilmot said hospital administrators have cooperated with what he called an “extensive investigation” of the allegations and have filed a report with the New Hampshire Board of Medicine.

“I want to give kudos to our investigative team,” Wilmot said. “They worked very, very hard on this. These types of investigations often take a very long time.”

Wilmot praised the patient for coming forward and reporting the alleged abuse to police.