The Penn State Department of Geography shares:
Professor Emeritus Wilbur Zelinsky passed peacefully at home on Saturday, May 4, 2013, surrounded by his family after a short illness. Information will be updated at http://www.geog.psu.edu/zelinsky-memorial
Zelinsky's writing were among those that pulled me into geography in college. I was fortunate that he was still teaching during my tenure at Penn State and I had ample opportunity to learn from him.