President-elect Joe Biden has picked Ron Klain as his chief of staff. Klain, 59, served as the ’Ebola tsar’ during the Barack Obama administration. He has previously worked with Biden in the 1980s. Biden praised Klain’s ’deep, varied experience’ in a statement on choosing his chief of staff. Klain has been a vocal critic of President Donald Trump, especially on the former’s Covid-19 response.