Edward Nyman's one-day employment marks the third time since August that a USAG management hire lasted less than a week.
Wieber won gold as part of Team USA's "Fierce Five" at the 2012 Olympics in London.
Leung is the fourth CEO of USA Gymnastics in the past two years.
A fourth Laureus Sportsman of the Year award puts Novak Djokovic level with Usain Bolt and one behind Roger Federer.
Engler last week said that some survivors of Larry Nassar's serial sexual abuse are "enjoying the spotlight."
An astonishing vault that earned Simone Biles yet another gold medal at the World Championships has been officially named "The Bile."
An astonishing vault which earned Simone Biles yet another gold medal in Qatar has been officially named 'The Biles'.
The 233-page report, which was commissioned by a Special Committee, spoke to over 100 witnesses and reviewed over 1.3 million documents.
USAG explained this move is an effort to expedite the processing of civil lawsuits related to the sexual abuse by Nassar.
USAG is facing lawsuits from about 220 gymnasts who say the former USA Gymnastics doctor abused them.