He emphasized his commitment to attracting more businesses to the state and balancing the budget.
"Illinois with the right leadership can again become a beacon for job growth and economic investment," he said. "Illinois can be a state that imports jobs rather than a target for other governors."
After officially announcing his candidacy, Brady headed to Springfield and will campaign in other cities across the state.
He joins Bruce Rauner, Treasurer Dan Rutherford and State Senator Kirk Dillard in the GOP race.