The man who literally wrote the laws on presidential transitions is now running one — and it could be the country’s most difficult handover of power since the Great Depression, with dueling health and economic crises as well as an unpredictable incumbent who may throw wrenches into the process. Ted Kaufman, Biden’s longtime chief of staff in the Senate and head of his 2020 transition effort, likely has more control over a future Biden administration than anyone other than the Democratic presidential nominee himself.