
Dr. Riordan received her BA cum laude in Biology from Harvard College. Her Medical Degree is from New York University where she was elected to Alpha Omega Alpha Medical Honor Society. Dr. Riordan did her Pediatric Internship and Residency at Harvard University's Massachusetts General Hospital and Boston Children's Hospital. She continued at Massachusetts General Hospital for her Pediatric Pulmonary Fellowship.
Dr. Riordan is board certified in both Pediatrics and Pediatric Pulmonology.
Dr. Riordan has lived in Tucson since 1993. She is married to Dr. David Siegel, Southwest Shoulder, Elbow and Hand Center. They have three daughters.
Children's Pulmonary Specialists was founded with the ideal of treating all of our patients as we would like our own families to be treated: with compassion and respect and with the highest quality of care.

Colleen Shehan-Bakewell RN, MS, NNPC, FNPC received her BS at Salisbury University in Maryland and her MS from the University of Arizona, where she was inducted into Sigma Theta Tau International Honor Society in Nursing. Her Nurse practitioner credentials include Neonatal Nurse Practitioner from Georgetown University and Family Nurse Practitioner from the University of Phoenix.
Colleen is nationally certified as both a Neonatal Nurse Practitioner by the National Certification Corporation for Obstetrics and Gynecology and Neonatal Nursing Specialties and a Family Nurse Practitioner by the American Academy of Nurse Practitioners. She has more than two decades of experience in neonatal intensive care with expertise in infants and children born prematurely, including chronic lung disease.
Originally from Bethesda Maryland, Colleen has lived in Tucson Arizona since 1989. She is married to Dr. Brock Bakewell, an Ophthalmologist with Fishkind * Bakewell *Maltzman Eye Care and Surgery Center. They have three sons - Kyle, Luke and Brett.
Open and honest communication, mutual respect and trust between the family and the health care professional are necessary to provide the best care for children. Optimal health is only achieved when health care professionals and families work together as partners.