Meet Our Providers

At the Sleep Center, we use a team approach to solving your sleep problems. Working together as an integrated unit, we have created a program that identifies, diagnoses and treats a broad range of sleep disorders.

Our technicians registered by the Board of Registered Polysomnographic Technologists as well as the American Association for Respiratory Care. Their training will assure accurate testing results for you and your referring physician.

Feel confident you have chosen a qualified team that will help you sleep better.

Yujean Han, DO

Yujean Han, DO

Yujean Han, DO, completed her residency in Psychiatry at the University of Oklahoma-Tulsa and a fellowship in Sleep Medicine at Dartmouth-Hitchcock Medical Center in Lebanon, New Hampshire. She was inspired to choose medicine because she's always enjoyed working and helping people. She's interested in peoples' personal stories and what they can do together to improve their health. She chose Sleep Medicine because she loves sleep, and thinks everyone deserves good sleep quality.

New to Yakima, she thinks the community and the people are so friendly and it reminds her of where she's from, Oklahoma. In her free time she enjoys traveling, cooking and party planning. Dr. Han is also fluent in Korean.

Joseph Jung, DO

Joseph Jung, DO

Joseph Jung, DO, completed his residency at Madigan Army Medical Center in Tacoma, Washington and a fellowship in Sleep Medicine at Larkin Hospital/Miami Children's Hospital/Miami Sleep Disorder Center in Miami, Florida. He was driven to pursue medicine as a career because he sees the medical field as an extension of his spiritual values to serve people who are vulnerable and in need of help.

Dr. Jung also views Sleep Medicine as an opportunity to positively impact the whole patient - mind, body and spirit. Dr. Jung enjoys spending time with his wife and children by exploring the outdoors, in particular visiting national parks.

Madhukar Kumar, MD

Madhukar Kumar, MD

Madhukar Kumar, MD, completed his residency at the University of Chicago and a fellowship at the Michael S. Aldrich Sleep Center at the University of Michigan. He was driven to pursue medicine as a career by a desire to alleviate suffering and help those in need, and he treats patients as he would like to be treated - with honesty, transparency, consistency and the most recent, evidence-based practices.

Dr. Kumar enjoys the feeling of community and access to outdoor activities in Yakima. He and his wife are busy caring for their two young daughters, but when he has free time, he enjoys walking, traveling, grilling food and watching movies.

David Kirk, PA-C

David Kirk, PA-C

David Kirk, PA-C, brings many years of experience to the Sleep Center at Memorial. Mr. Kirk moved to Yakima more than 30 years ago and first worked as a prosthetist/orthotist. His inspiration to pursue a career as a physician assistant came from his wife, Shelly, who is also a physician assistant. He graduated from the University of Washington Medex Northwest's Physician Assistant program. In his role as a physician assistant, Mr. Kirk enjoys working with patients, listening to their questions or concerns.

Mr. Kirk grew up in Spokane, he loves to bike to work (rain or shine) and enjoys gardening, fly fishing, cooking and traveling with his family. He volunteers with the White Pass Ski Patrol and the Apple Country Contra Dancers.