Christoph Thun-Hohenstein’s name may not ring a bell if you’re not deeply involved in the New York cultural scene, but the outgoing head of the city’s Austrian Cultural Forum has left a deep impression on those who are, “conceiving programs ranging from the music of 20th-century émigrés to the work of performance artists in the Eastern bloc; maintaining contacts with cultural institutions around the country; even hanging shows himself in his building’s diminutive exhibition space in the wee hours of the morning.”