specialty: OB/GYN, Family Practice
family: sister, Elizabeth Tally
father, was a gas station attendant. Was caught stealing at one point and his lawyer, Bill Birkman, helped Dennis through college.
age: 40 (was revealed to be 37 in episode 3.1)
Dennis was born in Winnetka, Illinois. Has a sister named Elizabeth Tally, who's husband Andy shot Dennis (2-23). He often works with the poor, has run 3 clinics in the South Side of Chicago. Attended private schools and was helped through college by Alderman Bill Birkman. Revealed that he was gay to Aaron (4-6).
Interests: restores antique cars (4-6), collects first editions (4-6), jogs 10 miles a day (4-6), does charity work (4-6).
Romantic Interests: Camille (before it was revealed that he was gay)