Physician Assistant/Nurse Practitioner




Bailey O’Donnell, P.A.-C.

Bailey is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Master of Physician Assistant Studies at St. Ambrose University, after completing her Bachelor of Science degree in Kinesiology and Health at Iowa State University. Bailey is a member of the American Academy of Physician Assistants and the Iowa Physician Assistant Society. She joined Dermatology P.C. in February 2020.

Bianca Waldschmidt, P.A.-C.

Bianca is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Masters of Science in Physician Assistant studies from the University of Nebraska Medical Center after receiving her Bachelor degree in Psychology from the University of Iowa. She is a member of the American Academy of Physician Assistants and the Society of Dermatology Physician Assistants. Bianca joined Dermatology P.C. in February 2018.

Elizabeth “Ellie” Hamer, P.A.-C.

Ellie is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Masters of Physician Assistant Studies from St. Ambrose University after receiving her Bachelor of Science degree in Biokinetics from Bethel University in St. Paul, MN. Ellie is a member of multiple professional organizations and enjoys volunteering throughout the Des Moines area. Ellie joined Dermatology, P.C. in September 2017.

Elizabeth Boeckman, P.A.-C.

Elizabeth is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Master of Physician Assistant Studies degree from St. Ambrose University after receiving her Bachelor of Arts degree in Biology from the University of Northern Iowa. She is a member of the American Academy of Physician Assistants, Iowa Physician Assistant Society, and the Society of Dermatology Physician Assistants. Elizabeth joined Dermatology P.C. in February of 2020.

Emily Hoffman, PA-C

Emily is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Masters of Physician Assistant Studies from St. Ambrose University after receiving her Bachelor of Science degree in Kinesiology from Iowa State University. Emily is a member of the American Academy of Physician Assistants, Iowa Physician Assistant Society, and Society of Dermatology Physician Assistants. She joined Dermatology PC in September 2020.

Jennifer A. Vandivier, P.A.-C.

Jennifer is a state licensed Physician Assistant accredited by the NCCPA. She graduated in 2002 from Des Moines University with a Bachelor of Science in Physician Assistant studies after achieving her Bachelor of Science-Nursing from Mount Mercy College. Jennifer has been practicing dermatology in our clinic since that time. Along with her impressive volunteer work, she is an active member of the following professional societies: The Iowa Physician Assistant Society, The American Academy of Physician Assistants, and the Society for Dermatology PA’s.

Megan Ferguson, A.R.N.P., D.C.N.P.

Megan is a state licensed Advanced Registered Nurse Practitioner. She is board certified in Family Practice by the American Academy of Nurse Practitioners (AANP). Megan graduated with highest distinction and honors with her Bachelor of Science degree from the University of Iowa in 2005. She then continued at the University of Iowa to receive her Masters degree as a Family Nurse Practitioner in 2009. She recently obtained her certification as a Dermatology Nurse Practitioner (DCNP) from the Dermatology Nurses Association. She is a member of the American Academy of Nurse Practitioners, Dermatology Nurses Association, and the Society of Dermatology Physician Assistants.

Mckenzie Tonks, P.A.-C.

McKenzie is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Masters of Science in Physician Assistant studies from Southern Illinois University after receiving her Bachelors of Science in Human Movement Science from Utah State University. She is a member of the American Academy of Physician Assistants and the Society of Dermatology Physician Assistants. McKenzie joined Dermatology P.C. in October 2022.

Sonja Baer, P.A.-C.

Sonja is a state licensed Physician Assistant accredited by the NCCPA. She has a Masters degree in Physician Assistant studies from Des Moines University. Sonja also has a Masters degree from Drake University in higher education and a Bachelors degree from Iowa State University in Physical education with a minor in Exercise science. As a Physician Assistant Sonja has worked in Orthopedics and also has 15 years experience as a certified athletic trainer and certified strength and conditioning specialist. She is currently a member of the Society of Dermatology Physician Assistants.

Stacy Murphy, P.A.-C.

Stacy is a state licensed Physician Assistant accredited by the National Commission on Certification of Physician Assistants (NCCPA). She earned her Masters of Physician Assistant Studies at Des Moines University, after completing her Bachelors of Arts degree in Psychology at the University of Iowa. Prior to working in dermatology, Stacy worked in orthopedic surgery for 10 years. Stacy is a member of the American Academy of Physician Assistants and the Society of Dermatology Physician Assistants.

Tonia K. Ackerman, M.S.N., A.R.N.P.

Tonia is a state licensed Advanced Registered Nurse Practitioner. She is board certified in Family Practice by the American Nurses Credentialing Center. Tonia graduated in 2002 with a Masters of Science degree in Nursing-Family Nurse Practitioner from Clarkson College in Omaha, NE. She also earned her Bachelor of Science in Nursing from Grand View College in 1999, and an Associate degree in Nursing(RN) in 1990 from Marshalltown Community College. She has over 18 years of experience in several areas of nursing. Tonia is a member of the Iowa Nurse Practitioner Society, American Nurses Association, and the Society of Dermatology Physician Assistants.