Advanced Practice Providers

Meet our Team of Advanced Practice Providers


Eric Busch, PA-C

Eric Busch has been a Physician Assistant at BNA since 2002. He graduated from Cornell University Medical College Physician Assistant program. He made his decision to pursue a medical career after working as an outdoor educator at the Grand Teton National Park in Wyoming.


Michael Kiley, PA-C

Michael was originally attracted to medicine after taking a course at the University of Colorado at Boulder to become an Emergency Medical Technician (EMT). He has worked on ski patrol and as an EMT at Boulder Community Hospital before graduating from Albany Medical College’s Physician Assistant Program. He has experience in Emergency Medicine, Orthopedic Surgery and Neurosurgery.

Brian Bixler, PA-C

Brian moved to Colorado in 2005 and became interested in medicine while working for the Aspen Skiing Company.  He worked as an EMT in Urgent Care in Snowmass and then as a Laboratory Technician in Boulder before attending Jefferson College of Health Sciences in Roanoke, VA for his Masters in Physician Assistant Studies.  He has a Bachelor’s degree from North Carolina State University in English and Music.  He worked as a hospitalist in Denver before joining BNA.

Jennifer Tierney, MSN, FNP-BC

Jennifer joined Boulder Neurosurgical and Spine Associated in 2010 as a Registered Nurse.  She has more than 12 years of neurosurgical experience.  She graduated with her Master of Science in Nursing and Nurse Practitioner from the University of Colorado in 2016.



Trenton Stickney, PA-C

Trent graduated in 2019 from Red Rocks Community College Physician Assistant program. Prior to becoming a PA, he worked at a family practice clinic in his hometown of Conifer, CO. Trent is a Colorado native who enjoys all that Colorado has to offer.He and his wife have two small children and are looking forward to establishing new roots as they integrate themselves into the community

Dillon Duval, PA-C

Before Physician Assistant school, Dillon worked within internal medicine as a medical/staff assistant and within the field of dialysis as a dialysis technician. In 2014, he graduated from Metropolitan State University with a Bachelor’s of Science in Biology and a minor in Nutrition. Dillon completed his Master’s of Science degree from the Stony Brook University PA program in New York. In his spare time, Dillon enjoys spending time with family and outdoor activities such as hiking/fishing.

Heather Free, PA-C

Heather graduated from Michigan State University in 2003 with a Bachelors’s in Neuroscience and Psychology. She worked in neuroscience and cancer research for 15 years before attending PA school at Red Rocks Community College in 2019. In her free time, Heather enjoys traveling and trying to visit all of the national parks. She loves all of the usual Colorado activities, hiking, biking, and camping!