From Chris Boyette, CNN

updated 10:44 PM EDT, Fri September 14, 2012

STORY HIGHLIGHTS

(CNN) -- The Boston Children's Hospital pediatric doctor charged with receipt of child pornography was disciplined for using a school computer to access adult pornography when he was medical director at Phillips Academy boarding school, school officials said Friday.

Richard Keller, 56, who is also a pediatrics clinical instructor at Harvard Medical School, was the medical director at Philips Academy for 19 years, according to John Palfrey, the head of the school.

In an e-mail to faculty, staff, students, alumni and parents on Friday, Palfrey said Keller was reprimanded in 1999 for using an academy computer to access pornography that featured adult subjects, and in 2002 was reprimanded for showing an inappropriate cartoon to students.

According to Palfrey, Keller was cited for "poor management and poor judgment," leading the Andover, Massachusetts, school to place him on administrative probation in 2009.

Palfrey went on to say that as recently as 2010, Keller sent an inappropriate voice-mail message to a colleague at the school. A claim by Keller that the school had discriminated against him was determined to be "groundless," according to Palfrey.

In April 2011, the academy informed Keller that his contract would not be renewed. The doctor resigned that month, the school said.

"We have no reason to believe that any of our students were involved in, or affected by, Dr. Keller's alleged criminal behavior," Palfrey said, adding the federal case made Thursday against Keller is unrelated to alleged misconduct at Phillips.

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School: Boston doctor was disciplined for viewing adult pornography