Thomas P. Sullivan, renowned Chicago trial attorney with a passion for “doing the right thing,” died last month at the age of 91.Sullivan was still a practicing partner at Jenner & Block where he had worked since 1954. He only left the firm from 1977 to 1981 to serve as the U.S. Attorney for the Northern District of Illinois, where he made an indelible impact on the Cook County court system as the driving force behind the Operation Greylord corruption probe.“Tom’s impact on the court system of Cook County is …