After getting his first Real Estate License in 1980, Doug Hartmann Sr. founded Hartmann Realtors in Collinsville in 1984 and ran a Sales and Property Management Company. Doug Hartmann Jr. bought the sales portion of Hartmann Realtors in 2006 and it rans as a Franchised Sales Brokerage for 12 years.
In September of 2018 Doug and Doug Jr, with the help