He obtained his Ph.D from the University of Kansas in 1995 under the direction of Dr. Donald M. Baer. Jesús serves on several editorial boards, including the European Journal of Behavior Analysis and the International Journal of Psychology and Psychological Therapy. His areas of interest include antecedent control of behavior, generalization, behavioral cusps, fluency-based teaching, treatment of autism, teaching of academic behavior, animal training, and rule- and contingency-shaped behavior.