Bill Taylor spent years fighting corruption in Ukraine. His last four months under Trump were the ‘antithesis’ of that.

Before the top U.S. diplomat to Ukraine became the most explosive witness in the House’s impeachment inquiry, he was anything but a household name in the United States. But in Ukraine, William B. Taylor Jr.’s reputation preceded him.

He had spent much of the 1990s telling Ukrainian politicians that nothing was more critical to their long-term prosperity than rooting out corruption and bolstering the rule of law, in his role as the head of U.S. development assistance for post-Soviet countries.