FBIS, FIAAADavid A. Hardy,
is the longest-established living space artist, having produced his first astronomical work around 1950 and being published in 1952, at the age of 16. For a TV interview, broadcast in June 2013, see this.
A list of books illustrated and/or written by David A. Hardy. Below that is an almost complete list which someone has kindly compiled of Hardy magazine cover work in the SF field (thank you, whoever you are!).