Considering that wording is from an official NASA biography, it's probably not non-existent: He currently serves as the Advanced Propulsion Theme Lead

Considering that wording is from an official NASA biography, it's probably not non-existent: He currently serves as the Advanced Propulsion Theme Lead for the NASA Engineering Directorate and is the JSC representative to the Nuclear Systems Working Group. In his role, White is serving to help the Agency incorporate high TRL advanced power and propulsion technologies into near and mid-term human exploration architectures. He also is pursuing theoretical and laboratory research on developing lower TRL advanced propulsion and power technologies in the advanced propulsion physics laboratory known as Eagleworks that is located at the Johnson Space Center. https://www.nasa.gov/ames/ocs/2014-summer-series/harold-white https://www.nasa.gov/ames/ocs/2014-summer-series/harold-whit...