Zvi Hirsch Chajes (Hebrew: צבי הירש חיות - November 20, 1805 - October 12, 1855; also Chayes or Hayot) was one of the foremost Galician talmudic scholars. He is best known for his work "Mevo Hatalmud" (Introduction to the Talmud), which serves both as commentary and introduction. Chajes is also known as "The Maharatz Chajes" (מהר"ץ חיות), the Hebrew acronym for "Our Teacher, the Rabbi, Zvi Chajes". Wikipedia
Presenting his analysis with the experience and insight of a world-renowned talmudic scholar, R. Chajes imparts a detailed history and classification of the Talmud and its underlying oral tradition. www.yasharbooks.com/Guide.html
The definitive Wikipedia entry for Zvi Hirsch Chajes. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Zvi_Hirsch_Chajes