Michael Isikoff, the investigative reporter who recently left NBC News, is joining Yahoo News as its chief investigative correspondent. He will start in August.

Mr. Isikoff will help build Yahoo’s new investigative unit and will be based in Washington. Yahoo is expected to announce Mr. Isikoff’s hiring on Monday.

“He’s a guy who breaks a lot of news and starts huge national conversations,” said Megan Liberman, the editor in chief of Yahoo News.

Mr. Isikoff has reported extensively on numerous national news stories, including the liaison between former President Bill Clinton and Monica Lewinsky, the war on terror and the Penn State sex abuse case. During his nearly four years at NBC News, which he joined in July 2010, he appeared frequently on “NBC Nightly News” and “Today,” and on MSNBC. He has also worked at The Washington Post and Newsweek.