Most Americans probably don’t know his name, but many have has seen Greg Zanis’ work — painted crosses with victims’ name enscribed on them — erected after a national tragedy.

While many of his friends were working in the mines, Walter was tasked with painting rows of crosses for those killed in the line of duty. "[I was] stencilling numbers of those who had been killed ...

Most Americans probably don’t know his name, but many have has seen Greg Zanis’ work — painted crosses with victims’ name enscribed on them — erected after a national tragedy.