Greg Koller, CEO of Milwaukee-based ProStar Inc., passed away unexpectedly on July 4 after suffering what appeared to be a heart attack. Koller was well-known in the Milwaukee area not only for ProStar, which installed wood floors in prominent locales such as the Milwaukee Art Museum and the Bradley Center, home of the Milwaukee Bucks, but also for his active role in the community, including work with Milwaukee Public Schools and the Boys and Girls Club of Greater Milwaukee. In 2010 ProStar was recognized as an Inner City Business of the Year. Koller is survived by his wife of 33 years, Judie, as well as his children Anne and Ben.