Our Team

Diane Neddenriep, M.D.

Dr. Neddenriep opened Pediatric Pulmonary Associates in 1993.  She is Board Certified by the American Board of Pediatrics in Pediatric Pulmonology.  She is a member of the American Academy of Pediatrics and the American College of Chest Physicians.  She served as the first woman Chief of Staff of Tucson. 


Sandy Younker-Hellman, R.N.

Sandy has worked with PPA for over 20 years! She currently teaches our Asthma Education Classes. Before PPA, she worked at Tucson Medical Center from 1974-1994 in a variety of respiratory health related roles including: Nurse Educator, Nurse Manager for the Adult Medical/Respiratory Unit, and Director of the Chest and Allergy Clinic.



Christian is our front office administrator. He is available to schedule your appointments and direct your phone calls appropriately. He is responsible for referrals and prior authorizations for office visits.  He is also responsible for all billing and collections.



Victoria is our Medical Assistant. In addition to assisting the doctors during clinic, you’ll see Victoria during flu vaccine administrations, prescription authorizations, and procedure scheduling.