I was looking at some of my favorite BATMAN material from the 1970's, of the Robbins, O'Neil, Adams, Novick, Giordano, Wein, Aparo, Grell and Golden period, that Chan is a part of...
http://www.comics.org/series/141/covers/?page=6...and Chan's part on the series spanned from BATMAN 262 (April 1975), and 268-283 (Oct 1975-Jan 1977). Mostly the covers as well as interior art.
As I recall, Chan primarily worked for Marvel, except for a brief 2 years or so for DC, and then went back to work almost exclusively for Marvel. But as I said, during his brief period at DC, Chan was extremely prolific, across virtually every title. After that, the cover-artist mantle at DC seemed to pass on to Buckler and Aparo.
