Mr. Biden’s decision caps an unusually rapid ascent for Ms. Khan. She was born in London to Pakistani parents who emigrated to the United States when she was 11. She first rose to prominence while a law student at Yale, where she wrote a paper laying out how modern antitrust laws had failed to check the power of Amazon. The paper attracted notice from policymakers, other lawyers and the press.Quiet and generally averse to the spotlight, she has played a critical role behind the scenes in recent years as a senior aide to the House judiciary committee on its 16 …
