WASHINGTON — The head of the federal agency that oversees supplies, transportation and office space for the federal government has resigned following reports of lavish spending at a Nevada training conference in 2010.

Martha Johnson, who led the General Services Administration, has submitted her resignation as the agency’s inspector general prepares to release a report on the training conference outside Las Vegas.

The Washington Post reports that organizers spent $835,000 on the event, which was attended by 300 employees. Some of the expenses included $3,200 for a mind reader, $6,300 on a commemorative coin set and $75,000 on a training exercise to build a bicycle.

White House chief of staff Jack Lew says the White House “acted quickly to determine who was responsible for such a gross misuse of taxpayer dollars.”