Ajit V. Pai, the Republican chairman of the Federal Communications Commission, said Monday that he would leave his post the day that President-elect Joseph R. Biden Jr. is sworn in, capping a tenure of sweeping deregulation across the telecommunications industry.
Mr. Pai’s most prominent effort was rolling back net neutrality rules that forbid internet providers from blocking content, slowing down its delivery or charging for higher priority on their networks. His Democratic predecessor put the rules in place with the support of liberal activists over the opposition of companies like AT&T and Comcast. But Mr. Pai undid the rules within a year of being appointed by President Trump.
Mr. Pai eliminated lower-profile rules governing the telecommunications industry, loosening media ownership restrictions and lifting some price caps in the lucrative market for business broadband connections. He also faced a global race to develop next generation wireless networks and more recently was drawn into the debate over the rules governing social media platforms like Facebook and YouTube.
He was widely expected to step down after Mr. Biden won the presidential election.