OIG Management

  • Kevin B. Muhlendorf, Acting Inspector General
  • Rafael “Rico” Medina, Deputy Inspector General for Investigations
  • Yamani Dole, Deputy Inspector General for Audits & Evaluations
  • Michael Mobbs, Counsel to the Inspector General

Kevin B. Muhlendorf serves as the Acting Inspector General (IG) of the Washington Metropolitan Area Transit Authority. As the Acting IG, Mr. Muhlendorf is the senior official responsible for audits, investigations, and oversight of WMATA’s activities and operations.  The Office of Inspector General (OIG) provides leadership in promoting economy and effectiveness in WMATA’s programs as well as identifying and preventing criminal fraud, waste, abuse and employee misconduct.

Prior to his appointment as Acting IG, Mr. Muhlendorf worked as a lawyer in private practice focusing on financial and accounting fraud, procurement fraud, and securities and commodities fraud.   Mr. Muhlendorf previously served for 6 years as a federal prosecutor in the Fraud Section of the Criminal Division of the US Department of Justice, where as a trial attorney and Assistant Chief he investigated and prosecuted complex white-collar criminal cases. He also served 6 years as Senior Counsel in the Enforcement Division of the US Securities and Exchange Commission. After graduating from the William and Mary School of Law, Mr. Muhlendorf clerked for a federal judge in the US District Court for the District of Columbia. For the past 8 years, Mr. Muhlendorf has taught Complex Securities Investigations as an adjunct professor at Georgetown University Law School.

Rafael “Rico” Medina serves as the Deputy Inspector General (DIG) for Investigations of the Washington Metropolitan Area Transit Authority. As the DIG, Mr. Medina is the senior official responsible for investigations, cybercrimes and data analytics impacting WMATA’s activities and operations. 

Mr. Medina began his career over 32 years ago as a special agent with the US Air Force Office of Special Investigations. After leaving the Air Force, he joined the Inspector General community working for the Offices of Inspectors General of the Federal Deposit Insurance Corporation/RTC, the US Small Business Administration and the US Postal Service specializing in financial crimes, procurement fraud, public corruption and cybercrimes.

Prior to his current assignment, Mr. Medina’s executive leadership roles have included Deputy Assistant Inspector General for Investigations, Deputy Chief Data Officer (CDO) and Executive Special Agent in Charge where he directed investigative operations throughout the United States as well as Puerto Rico, the US Virgin Islands and Europe.  In his role as the Deputy CDO, he consistently relied on emerging technologies, directed data driven initiatives and produced data analytic models that uncovered fraud, waste and abuse as the suspicious activity was occurring.

Throughout his career, he has exercised oversight over billions of dollars in federally funded programs, agency generated revenue and procurement expenditures resulting in the identification and detection of billions of dollars in fraudulent activity.


Yamani A. Dole serves as the Deputy Inspector General for Audits & Evaluations of the Washington Metropolitan Area Transit Authority. He is responsible for overseeing OIG audits and evaluations of WMATA programs and operations.

Mr. Dole’s leadership and auditing expertise spans over twenty years, having held leadership positions in government and the private sector. Since joining WMATA OIG in 2018, Mr. Dole has served as an Audit Manager and Audit Director. His contributions to the mission of WMATA OIG have been instrumental in enhancing the effectiveness and efficiency of WMATA programs and operations. Most recently, Mr. Dole and his team received the exemplary Knighton Award from the Association of Local Government Auditors. This national accolade recognizes the best performance audits of the year.

Prior to joining WMATA OIG, Mr. Dole served as the Deputy Auditor to the Board at Fairfax County. There, he performed comprehensive reviews of major departments, programs, and authorities within the county. Mr. Dole also worked in the private sector leading audit teams through complex and challenging audits in the United States and Asia. While at the Alliance for Audited Media, he managed over 125 audits earning him the prestigious Gold Standard Award of Excellence, the highest recognition presented by the CEO. Earlier in his career, Mr. Dole also gained valuable experience as a Financial Advisor at Merrill Lynch.

He holds certifications as a Certified Internal Auditor, Certified Government Auditing Professional, and Certified Fraud Examiner, reflecting his commitment to maintaining high professional standards. Additionally, Mr. Dole has completed a Leadership and Management Certification from the Wharton School at the University of Pennsylvania.

Michael H. Mobbs serves as the Counsel to the Inspector General of the Washington Metropolitan Area Transit Authority.

Before joining OIG, Mr. Mobbs served more than a decade as General Counsel to Inspectors General at the Department of State, Department of Homeland Security, and the Special Inspector General for Iraq Reconstruction.

Mr. Mobbs has had extensive legal and national security experience in government and the private sector. During the Cold War and final years of the Soviet empire, he practiced international commercial law in several U.S. law firms where he was the managing partner of their offices in Russia and Hungary.

Leaving the private sector for a time, Mr. Mobbs was appointed by President Reagan and confirmed by the U.S. Senate to serve in the U.S.-Soviet nuclear arms negotiations, where he was the Secretary of Defense’s senior representative at the Strategic Arms Reduction Talks in Geneva and later directed policy formulation in Washington for all U.S.-Soviet nuclear arms control. After returning to private law practice, he was called to public service again following the 9/11 attacks to serve in the Bush Administration on numerous Defense Department missions in the Global War on Terrorism.

Mr. Mobbs graduated summa cum laude with exceptional distinction in Russian Studies from Yale University, where he was elected to Phi Beta Kappa. He holds a J.D. degree from the University of Chicago Law School, where he was a member of the Mandel Legal Aid Clinic. Mr. Mobbs has authored numerous publications on law and national security and speaks fluent Russian.