 His design and evaluation work with CAU has continued to the present.In 2001, Johnson was reassigned from FCOD to the Space Shuttle Branch, where he has held various positions including direct support to the crews of STS-100 and STS-108, chief of shuttle abort planning and procedures for contingency scenarios, and ascent procedure development.He also was a key player on several "tiger teams" during the investigation into the cause of the Columbia accident in 2003.