Bill Yosses was the pastry chef at Bouley Bakery for some years. Then he became pastry chef of Citarella, which was later renamed Josephs by Citarella. That restaurant's executive chef, Brian Bistrong — also a Bouley alumnus — left and became executive chef of The Harrison, and Bill became executive chef of Josephs.
But it closed in April, I'm trying to hunt Bill down and his e-mails are bouncing.
If you happen to know where he is, please let me know.