Top Columbus Zoo and Aquarium executives have allowed relatives to live in houses owned or controlled by the zoo, and sought tickets for their family members to attend various entertainment events, a Dispatch investigation found. For several years, President and CEO Tom Stalf's in-laws rented a home that had been donated to the zoo, and Chief Financial Officer Greg Bell's daughter is a tenant of another home controlled by the zoo. The properties were never advertised for rent or offered to outsiders or other zoo employees, The Dispatch learned. Questions by The Dispatch about the personal use of zoo resources have sparked an internal review by the zoo’s board of directors.