Isabelle Cheng (), also known as Cheng Nian-tzu, was an intelligence agent for the National Security Bureau of

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...

. She came to public attention when her relationship with

Donald Keyser Donald Willis Keyser (born 17 July 1943) retired from the United States Department of State in September 2004 after a 32-year career. He had been a member of the Senior Foreign Service since 1990, and held Washington-based ambassadorial-level assig ...

, an official of the

United States Department of State The United States Department of State (DOS), or simply the State Department, is an United States federal executive departments, executive department of the U.S. federal government responsible for the country's foreign policy of the United State ...

, became part of criminal charges against Keyser — in 2005, Keyser pleaded guilty to lying about the relationship, and to unauthorized possession of secret documents. Keyser has not been charged with espionage, however. While in the United States, Cheng was operating from the

Taipei Economic and Cultural Representative Office The Taipei Economic and Cultural Representative Office (TECRO), also known as Taipei Economic and Cultural Office (TECO), Taipei Representative Office (TRO) or Taipei Mission, is an alternative diplomatic institution serving as a ''de facto'' e ...

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

, but has since been called back to Taiwan. Cheng assisted the FBI in their investigation of Keyser.

References

{{DEFAULTSORT:Cheng, Isabelle Living people Taiwanese spies Year of birth missing (living people)