Over the past 30+ years, he has been on the faculty of three different pediatric departments: the University of Colorado (10 years), the Universidade Federal do Rio Grande do Norte in Natal, Brazil (3 years), and the University of Arizona (30 years). During his entire tenure at Colorado and Arizona, he taught medical students and pediatric residents. He had a panel of patients with chronic conditions that he followed and was on call for after clinic hours. Most of these patients were special needs children with disabilities and complicated multi-system problems. He has conducted multiple research projects, most of which developed from problems he saw in his patients, and where he felt there were no readily available answers in the medical literature. He has just completed a large NIH-funded investigation on toddlers with cerebral palsy. He has more than 60 published articles in peer-reviewed medical journals and 20 chapters in medical textbooks. His international experience over the past 30 years included clinical work, teaching, research, and administrative responsibilities in more than a dozen different countries. He is the Co-Founder of an extensive non-profit cross-border project in Nogales, Mexico: Arizona Sonora Border Projects for Inclusion (ARSOBO). The project trains and hires individuals with disabilities to construct the medical devices they use. Wheelchair users construct all-terrain wheelchairs, expert technicians with a prosthetic leg fabricate prostheses for others, and the hearing-impaired assist in the hearing health clinic where hearing aids are distributed. The medical devices are sold to families, but only at a cost they can afford.