Johnson graduated from the College of Idaho with a degree in zoology.
Johnson holds a second master's degree in medical management from Carnegie Mellon University.
[1] In February 2014, Johnson became editor-in-chief of the journal Abdominal Imaging, succeeding Morton Meyers.
[2] During Johnson's tenure as chief editor, the journal was renamed Abdominal Radiology in January 2016.
[4] He said virtual colonoscopy finds 90% of large, precancerous polyps but is less successful with smaller ones.