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ӰԺ 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ӰԺ 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.