Ambassador Bill Taylor came out of retirement to lead the US embassy in Kyiv – a decision he did not take lightly. Now the longtime diplomat is a central figure in the House impeachment inquiry into U.S. President Donald Trump and will become one of the first witnesses to testify publicly as part of the probe.
Ukraine-U.S. Relations
CNN: Top US diplomat to Ukraine came out of retirement for the job

Bill Taylor, the top U.S. Diplomat to Ukraine, leaves Capitol Hill on Oct. 22, 2019 in Washington, DC.