That is Joseph Acaba, the Puerto Rican-American US Astronaut that is training with the Russians to go up to the International Space Station. To do so he has had to learn Russian and he is actively training in all the commands required to be in space. He also has made many friends and from his accounts has grown to respect and admire his colleagues. Kudos to you, Mr. Acaba!
To see some of his pictures and to just keep abreast of his training and new development catch him at Twitter.com with his handle Astro Acaba. Here is a link to a neat picture.