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.

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.


Leah Musch, FNP-C

Leah graduated with her Master of Science in Nursing and Nurse Practitioner in 2019 from Graceland University. At a young age, she found science and medicine interesting, which led her to pursue a degree in nursing and then ultimately her advanced practice degree. She enjoys all the outdoor activities that Colorado has to offer, especially skiing.

Grant Bracken, PA-C

In 2018, Grant graduated from Augustana College in Rock Island, IL with a Bachelor’s in Neuroscience and Pre-Medicine while simultaneously working as an emergency room technician. He then completed his Master’s of Medical Science degree at Midwestern University in Downers Grove, IL in September 2020. Prior to graduating, Grant gained experience in neurosurgery while training at St. Anthony Hospital in Lakewood, CO. In his free time, he enjoy playing sports and anything that involves the outdoors