Subway Graffiti Artist Iz the Wiz, Michael Martin, Dies at 50 – Obituary (Obit) – NYTimes.com:
“Look at any movie shot on location in New York from the late 1970s to the early 1980s, and you will very likely see an Iz the Wiz tag,” Mr. Walker said. “He told me once that in 1982 he went out every night and did at least a hundred throw-ups” — letters filled in quickly with a thin layer of color. “People can’t fathom it.”