"Saltcedar Management Options". Keith Duncan, New Mexico State University. Hosted by Tala Awada Dr. Keith W. Duncan is a professor with New Mexico State University Cooperative Extension Service and Agriculture Experiment Station. Dr. Duncan earned a Bachelor's (1974) and Master's (1976) from Texas Tech University and Ph.D. (1981) in Range Science from Texas A&M University. Dr. Duncan worked with Lilly Research Laboratories as a field research scientist before moving to New Mexico in 1984 as the Brush and Weed Specialist. Dr. Duncan is responsible for conducting statewide research/demonstration trials on noxious rangeland and noncropland plant.s