Richard Keller, an Andover pediatrician and Phillips Academy head, held over child porn

Prominent Andover pediatrician Richard Keller has been arrested on child pornography charges.

Keller is reportedly a Boston Children’s Hospital pediatrician, Harvard Medical School pediatrics instructor and former medical director at Phillips Academy.

According to the Eagle Tribune, federal agents found more than 500 photographs and as many as 100 films on DVD of children involved in sexually explicit conduct when they raided Keller's Andover home Wednesday morning.

A 56-year-old is accused of buying and owning child pornography from an unidentified overseas movie production company.

Federal investigators said the films showed mostly underage boys, WHDH reported.

Keller "appeared to have a dedicated sexual interest in children, going back several decades," the Boston Herald quoted Assistant US Attorney Michael I. Yoon as saying.

The Yale grad, who specialized in pediatric diabetes, spent the last 20 years as on-site doctor as Camp Joslin in Charlton, according to the Boston Herald.

He was also "affiliated with Camp Mah-Kee-Nac" in Lenox.

Officials at Children's Hospital released a statement that said:

"When the hospital learned of the allegations against Dr. Keller earlier today he was immediately put on administrative leave… No complaints or concerns have been expressed by any patients or family members about the care Dr Keller provided while he was at Children's."

The pornography was allegedly delivered to Keller on campus at Phillips Academy, where he was a medical director for 19 years before resigning last year — "for reasons completely unrelated to the charges being brought against him right now," spokesman Stephen Porter reportedly said.

"The Academy told him they were not going to renew his contract for reasons not related … He chose to resign," Porter said, adding that the school was not aware of any inappropriate behavior. 

Among the Phillips Academy alumni are both George Bushes, actor Jack Lemmon, actress Olivia Wilde, novelist Julia Alvarez, and Facebook co-founder Chris Hughes.

Keller has pleaded not guilty to the charges in federal court in Boston.

As US marshals escorted Keller from the court, he mouthed the words "I love you" to his wife.

The next hearing is set for Monday. If convicted, Keller faces up to 20 years in prison.

The Tribune cited Keller's neighbor, Mary Carbone, as saying the doctor and his wife moved onto the street about a year ago and had a baby shortly after.