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David A. Sonnenfeld is Professor of Sociology and Environmental Policy at the State University of New York College of Environmental Science and Forestry (SUNY-ESF), in Syracuse, New York. I've been contributing to Wikipedia since 2006. My professional homepage is: http://www.esf.edu/es/sonnenfeld.
One or more of the violinists from Vienna, below, may have the surname, Sonnenfeld; possibly Gustaw Adolf or Nandor Sonnenfeld. It also is possible that he (or they) is distantly related to me. (The middle musician may bear a resemblance to Joseph Rosenstock, though I'm not sure the timing is right. Rosenstock was a pianist and conductor in Berlin in the 1930s.) I would be most appreciative of any information anyone has about any of these musicians. Thank you.