After graduating Summa Cum Laude from Albertus Magnus College, Harding pursued his law degree at New York Law School in Manhattan. After graduation from New York Law, Harding was admitted to the Connecticut Bar. Specializing in Probate, Real Estate, Wills and Trusts, and Municipal law, Attorney Harding worked as an associate attorney at multiple firms until opening his own practice in 2015. Stephen operated Harding Law until 2025, when he joined Zabel Schellenberg, PLC.

In addition to his legal career, Harding has served the State of Connecticut in various capacities. First as State Representative from 2015-2023. Then as State Senator from 2023-Present. Additionally, in the State Senate, Stephen was elected to serve as Minority Leader in February of 2024, where he still serves in said position today.

Harding has been a resident of Brookfield for over 30 years, where he currently lives with his wife, Kelly, son, Carter, daughter, Piper, and golden retriever, Kennedy.