Passage: Cooper's media experience began early. As a baby, he was photographed by Diane Arbus for Harper's Bazaar.  At the age of three, Cooper was a guest on The Tonight Show on September 17, 1970, appearing with his mother. At the age of nine, he appeared on To Tell the Truth as an impostor.  From age 10 to 13, Cooper modeled with Ford Models for Ralph Lauren, Calvin Klein and Macy's.Cooper's father suffered a series of heart attacks while undergoing open-heart surgery, and died January 5, 1978, at the age of 50. Cooper considers his father's book Families to be "sort of a guide on...how he would have wanted me to live my life and the choices he would have wanted me to make. And so I feel very connected to him."Cooper's older brother, Carter Vanderbilt Cooper, died by suicide on July 22, 1988, at age 23, by jumping from the 14th-floor terrace of Vanderbilt's New York City penthouse apartment. Gloria Vanderbilt later wrote about her son's death in the book A Mother's Story, in which she expressed her belief that the suicide was caused by a psychotic episode induced by an allergy to the anti-asthma prescription drug salbutamol. Anderson cites Carter's suicide for sparking his interest in journalism.

Question: Who photographed the baby?
Diane Arbus