An active sportsperson, Theresa Siwinski was involved in many sports while she was in Mercy High School from 1975 through 1979. She was a sprinter in track and she participated in 100 yard dash, 220 yard dash and the 4 x 400 relay races. She was also a member of several committees and Mercy High School and she helped in organizing the dance and prom events.
Theresa Siwinski was an independent contractor for Delito and Gambaccini Court Reporting Agency from 1982 to 1985. Her responsibilities included submitting the content of pretrial depositions to attorneys. She is also a small business owner and owns the Express Laundry at 858 Washington Street, Middletown, Connecticut. Theresa purchased the Express Laundry in April 2006 and she takes care of all the day to day businesses of the laundry. The full service Laundromat includes services of wash-dry-fold and drop off dry-cleaning as well as coin operated facilities.
Theresa Siwinski is also a certified Reiki Master and she renovated the Reading Counts program and John Lyman Elementary School. She also got a Parent Volunteer Award for her work with the program where students could practice their reading skills and get awards from the principal of the school at assemblys.