A full English translation of both parts of the Sefer Chofetz Chaim--Mekor ha-Chaim and Be'er Mayim Chaim--with facing Hebrew and English text and a detailed commentary, Yad Dovid. Gives an extensive overview of the basic concepts of forbidden speech.
Rabbi Yisrael Meir (HaCohen) Kagan, also known popularly as the Chofetz Chaim, was an influential Eastern European rabbi, Halakhist, and ethicist whose works continue to be widely influential in Jewish life.