Lester Yen, MD, FACS

Ryan Mertens, DO, joined The Iowa Clinic in 2022 because he loves the passion fellow providers and staff have for the Clinic and patient care. Dr. Mertens practiced independently in primary care before returning to fellowship training in Pulmonology at Creighton University. He chose this specialty because of its many modalities. Between the clinic, hospital, and ICU, it provides him with numerous opportunities for patient care. Difficulties with breathing can be a very anxiety provoking and traumatic experience and he finds helping patients in these specific situations to be very gratifying.

Dr. Tyler Aasen joined The Iowa Clinic in 2020 to be part of an organization that takes pride in providing high-quality patient care and where physicians can be involved in leadership to make patient-centered decisions and policies. He chose gastroenterology because it enables him to develop long term patient relationships while also allowing for more immediate and direct patient impact through procedural interventions. A physician specializing in GI cares for patients at some of their most vulnerable and difficult times. The most rewarding part of his job is seeing his patients recover and get back to normal life.