 Wallace continued to co-own and take an interest in the company he had established, Pioneer Hi-Bred (formerly known as the Hi-Bred Corn Company), and he established an experimental farm at his New York estate.He focused much of his efforts on the study of chickens, and Pioneer Hi-Bred's chickens at one point constituted three-quarters of all commercially sold eggs worldwide.He also wrote or co-wrote several works on agriculture, including a book on the history of corn.