His leadership role with Dallas ISD won him the position of president of the Texas State Teachers Association.
Kimball's overloaded schedule affected his health drastically, and he resigned from his position as superintendent after advice from his doctor.
During his first year (1929) in office as vice-president of the Baylor health system, after noticing large amounts of unpaid bills, many belonging to Dallas educators, he developed a plan in which a person could prepay US$0.50 a month, or $6.00 per year to cover the cost of a 21-day stay at a hospital, effective beginning one-week into the hospital stay.
Employees of the Dallas Morning News and WFAA-TV and WFAA Radio also joined the program.
The success rate of his plan prompted the American Hospital Association to ask Kimball to prepare a paper detailing the mechanics behind the program.
He accepted a job as an adjunct professor at Southern Methodist University, lecturing about education administration.
A Christian, Kimball also served as chairman of the civil service commission of the City of Dallas.