8:30am - 4:00pm (Mon-Fri)
Closed 12:00-1:00pm for Cleaning (Mon-Fri)
Testing appointments 8:30am - 3:00pm (M/Tu/W/F)


4745 Arapahoe Ave. Suite 130, Boulder, CO 80303
300 Exempla Circle Suite 210, Lafayette, CO 80026

Meet Our Specialists

Donald A. Maschka


Dr. Maschka is a board-certified Otolaryngologist and has completed a fellowship in the AmericanAcademy of Otolaryngic Allergy. He received his doctorate of medicine from the University of Iowa in 1992 and completed his residency in 1997 at the University of Iowa Hospitals and Clinics. After residency, he practiced in Iowa for 17 years and enjoyed a high-paced and varied otolaryngology practice.

During this time he trained ENT residents as an Associate Professor for the University of Iowa and has also provided services for the Mayo Clinic Health System in Minnesota. In 2006 Dr. Maschka founded a successful allergy practice utilizing innovative allergy techniques. He has served as a member of the board of Directors on hospital, clinic, and surgery center boards. He has won numerous awards and has been recognized for his dedication to patient care and service to the local community. He joined the staff of Boulder Valley Ears, Nose, and Throat in 2015. His special interests include general and pediatric otolaryngology, thyroid surgery, and the diagnosis and treatment of allergic disorders of the head and neck

Stephane Stumpf

Allergy Technician

Stephane joined Boulder Valley Allergy October of 2018. She is a nationally certified Medical Assistant and an Allergy Technician. With over 10 years in the allergy field, Stephane’s extensive experience with testing and treating patient allergies assures each and every patient experience is the very best. When not seeing patients, Stephane can be found enjoying time crafting and hiking with her husband Zach and their 2 furry kids, Cooper and Charlie.