Still, Lewis maintained that the acts directed at Muhammad were not typical for Harvard.
"This community is a very tolerant and inclusive one, and the acts directed against Mr. Muhammad are notable for being exceptional," Lewis wrote. " I do not believe these acts represent a systemic problem at Harvard."
Muhammad, who could not be reached for comment yesterday, ended his message to Mather House residents on a positive note.
"My affection for this House is boundless, and the support I have received from the vast majority of our community has been a source of great comfort to me during this difficult time," Muhammad said.
In light of the recent acts, his final words were particularly apt.
"I wish you all well, individually and communally, and urge you to hold fast to your principles, however lofty and unattainable they may seem," he wrote.