Manned mission to Mars will be possible with current technology

Robert Zubrin : engineer
David Baker : engineer
"Mars Direct is a proposal for a manned mission to Mars that is designed to be both cost-effective and possible with current technology. It was originally detailed in a research paper by NASA engineers Robert Zubrin and David Baker in 1990, and later expanded upon in Zubrin's 1996 book The Case for Mars. It now serves as a staple of Zubrin's speaking engagements and general advocacy as head of the Mars Society, an organization devoted to the colonization of Mars."