Tim Gill, founder and former chairman of Denver-based Quark Inc., will speak on "Being Gay In The Business World" at the University of Colorado at Â鶹¹ÙÍø April 24 at the Museum Collections Building, formerly the Geography Building, room W-100. The talk is at 3 p.m. followed by a reception in Dinosaur Hall of the Henderson Museum. Gill is a graduate of the CU-Â鶹¹ÙÍø College of Engineering and Applied Sciences, where he earned a degree in applied mathematics in 1976. He went on to build Quark into a $1 billion computer software company.