Director of product development (retired) at J. Frank Schmidt & Son Co.
Keith Warren, tree breeder and nurseryman, has significantly reshaped the urban tree palette of America. He spent a 40-year career with J. Frank Schmidt and Son Co. as a nursery manager and director of product development. Recently retired, he is still active with the company. His tree breeding, selection, and cooperative introduction programs were among the most productive ever, guiding 87 new tree cultivars to commercial introduction, including 37 trademarked or patented trees from his personal breeding and selection work. He published a comprehensive new book, co-authored with Dr. Michael Dirr, The Tree Book: Superior Selections for Landscapes, Streetscapes, and Gardens, in 2019