Tish was born in the Dominican Republic in 1968 and grew up in La Grange Park, where her parents still reside. She graduated from Lyons Township High School in 1986 and the University of Illinois/Urbana-Champaign in 1990. She received masters degrees in musicology in 1992 and in library science in 1993, both from UIUC.
Tish is a reference librarian at the Gail Borden Public Library and has worked there since 1993. She has lived in the northeast neighborhood of Elgin since 1998. Her hobbies include reading, knitting, bicycling, music, and travel. Tish speaks Spanish fluently and has a keen interest in languages too.