Jan-Erik von Löwenadler, 74, a Swedish art dealer and collector who specialized in the art of the 1980s and more recently had collected contemporary Chinese art, died of his own hand in Nice on July 24. A bon-vivant who spoke many languages and had clients in many countries, Löwenadler made a splash on the New York scene in 1981 with an exhibition by Dennis Oppenheim (that caught on fire) on the ground floor, and a display in the basement of Elvis and Marilyn portraits by a then-unshown artist named Keith Haring. He championed Rammellzee, Salome and Bernar Venet, among other artists, and was good friends with artists like Arman and Christo, and collectors like Elaine Dannheisser and Don and Mera Rubell. Löwenadler earned his fortune running language schools, notably in France, and operated Bonlow, his Greene Street gallery, in partnership with Jeanette Bonnier. A diabetic, Löwenadler had been depressed -- according to a Swedish press report, he had bought heavily at the Damien Hirst auction that took place in London on the same day as the 2008 Lehman Brothers bankruptcy -- and is said to have died from a double dose of insulin.