I didn't know until a few minutes ago that he wrote a vast work on the Yerushalmi! I was at what I think was his first siyum on Yerushalmi back in the 70s at the Young Israel of West Hempstead and it was an inspiration for me ever since!
The Jerusalem Talmud: Complete Edition (Studia Judaica): Guggenheimer, Heinrich W.: 9783110687972: Amazon.com: Books
I see his notes are available at
and hope to incorporate some of them in my commentary on the Yerushalmi.