Mr. Keyso is a long time veteran of the IRS, with more than 25 years of service. During his career, he has held numerous positions within the IRS, including serving as the IRS Chief of Staff, 18 years in various positions in the IRS Office of Chief Counsel, including as Associate Chief Counsel of the Income Tax and Accounting Division. Mr. Keyso also served as Special Counsel to the Chief Counsel and as an attorney in the Procedure and Administration Division. Before coming to Washington, DC, Mr. Keyso worked as a revenue agent in the former Newark, New Jersey District, where he later served as a technical advisor to the Chief, Examination Division. Since July 2017, Mr. Keyso has been the Deputy Chief of Appeals and acting Appeals Chief.