Our organizational structure closely resembles the private sector model of organizing around customers with similar needs. Commissioner Specialized IRS units report directly to the Commissioner's office. The IRS Chief Counsel also reports to the Treasury General Counsel on certain matters. Commissioner, Internal Revenue — Charles P. Rettig Chief of Staff — Kevin Q. McIver IRS Chief Counsel — William M. Paul* Taxpayer Advocate Service — Erin M. Collins, National Taxpayer Advocate Appeals — Andy Keyso, Chief of Independent Office of Appeals Communications and Liaison — Terry Lemons, Chief *Denotes acting assignment Deputy Commissioner for Services and Enforcement The Deputy Commissioner reports directly to the Commissioner and oversees the four primary operating divisions and other service and enforcement functions: Deputy Commissioner for Services and Enforcement — Douglas O’Donnell Wage and Investment Division — Ken Corbin, Commissioner Large Business and International Division — Nikole Flax, Commissioner Small Business/Self Employed Division Darren Guillot, Commissioner, Collection De Lon Harris, Commissioner, Examination Tax Exempt and Government Entities Division — Sunita Lough, Commissioner Criminal Investigation — James C. Lee, Chief Return Preparer Office — Carol Campbell, Director Office of Professional Responsibility — Sharyn Fisk, Director Office of Online Services — Karen S. Howard, Director Enterprise Digitalization & Case Management — Justin Abold-LaBreche and Harrison Smith, Co-Directors Deputy Commissioner for Operations Support The Deputy Commissioner reports directly to the Commissioner and oversees the integrated IRS support functions: Deputy Commissioner for Operations Support — Jeff Tribiano Assistant Deputy Commissioner for Operations Support — Liz Dugger Co-Directors, Enterprise Digitalization & Case Management — Justin Abold-LaBreche and Harrison Smith Chief Information Officer — Nancy Sieger Chief Facilities Management and Security Service — Richard Rodriguez Chief Research and Analytics Officer — Barry Johnson* Chief Diversity Officer — Valerie Gunter Chief Human Capital Officer — Robin D. Bailey, Jr. Chief Financial Officer — Teresa Hunter Chief Privacy Officer - Robert Choi Chief Procurement Officer — Shanna Webbers Chief Risk Officer — Thomas Brandt *Denotes acting assignment Organization Chart See the basic structure of today's IRS in this picture of the IRS Organization Chart PDF. At-a-Glance: IRS Divisions and Principal Offices Get an overview of the four primary operating divisions and the other principal offices in the IRS organization.