William K. Hartmann is a noted astronomer, author and artist. He is senior scientist at the Planetary Science Institute in Tucson. He was an investigator on the Mariner 9 Mars probe which mapped the Red Planet for the first time in 1972. An asteroid (#3341) is named for him.
He has written and illustrated several widely-used textbooks on astronomy, and also co-authored and co-illustrated five pictoral books of space art, The Grand Tour, Cycles of Fire, Out of the Cradle,The History of Earth, and In The Stream of Stars:The Soviet-American Space Art Book.