Wesley LePatner, 43, was among the four people killed by a gunman who stormed the Park Avenue building where she worked on Monday.

"We cannot properly express the grief we feel upon the sudden and tragic loss of Wesley," the LePatner family told Fortune, adding she was a "driven and extraordinarily talented professional and colleague.

LePatner also was an active volunteer, serving on Yale's Library Council and the school's “For Humanity” fundraising campaign.