After college, he returned to Hoquiam for two years and was employed at Hoquiam High School as a math teacher. He subsequently returned to the University of Washington to attend their prestigious School of Dentistry. He graduated with his Doctor of Dental Surgery (D.D.S) in 2005 as an honors student in fixed prosthodontics.

After graduation, he returned to Grays Harbor and worked as an associate dentist for over eight years with his childhood dentist and mentor, Dr. Richard Hanson. In 2014, Dr. Johnson purchased the practice of long time local dentist, Dr. James Pritchett. Dr. Johnson strives to continue to provide the same level of quality care that was given for so many years by his predecessors.

Dr. Johnson values continuing dental education. He has been a member of the Tacoma Implant Study Club since 2005, and has been involved with multiple Spear Study clubs. Dr. Johnson has also previously served as an affiliate instructor with the Department of Oral Medicine at the University of Washington School of Dentistry.