During Tribune’s ownership of the Chicago Cubs, he served as club president from December 1988 to October 1991.
Grenesko served as vice president of corporate finance for Blunt, Ellis & Loewi, Inc. before joining the Tribune Company in June 1980 as treasury manager.
[1][2] Tribune, which owned the Chicago Cubs, named Grenesko executive vice president in charge of business operations for the team in February 1985.
[3][4] In December 1988, he was promoted to club president and chief executive officer.
[7] In 2005, he was among several Tribune executives named in a class action lawsuit over allegations the company overstated circulation numbers in an effort to charge more for advertising.