"Dona Dona" was originally written by Aaron Zeitlin (lyrics) and Sholom Secunda (music) for the Yiddish musical "Esterke" in the early 1940s. The song became a favorite of the American folk revival in the 1960's has been performed and recorded many times by folks including Joan Baez, Donavon, and Theodore Bikel. You can read the full lyrics in Yiddish and English at Wikipedia.
Hat tip to YouTube user OrangeJunk20 for posting the video.
Update: Sigh. One click on OrangeJunk20's YouTube page clarified things a bit. The Kris (the guy) in the video is singer/songwriter Kris Shred.