Paul C. Ha turned in his keys on Friday, his last official act before heading to the List Visual Art Center at MIT. Since 2002, Ha had been director of the Contemporary Art Museum here, and a prominent citizen of the arts. He oversaw the construction and opening of the new museum building on Washington at Spring in Grand Center, but his legacy here was to program it as a friendly, fun place in which to see art, to party with art, and to support artists. According to those keep track of such things, he produced 92 exhibitions during his tenure, bringing 223 artists, most of them young and some of them otherwise unknown, to the attention of St. Louis audiences. He raised the profile and endowment of CAM. I followed Ha (@paulha8) on Twitter and I enjoyed him enjoying St. Louis. He attended a million openings, concerts, sporting events (mostly baseball), and lectures ' live tweeting many of them. He will be sorely missed and tough to replace.