Surgery: March 2011
Dallas Wiens underwent the first full facial transplant in the United States. When Wiens was painting his church as a volunteer in November 2008, his head got too close to a high-voltage power line. He lost almost his entire face from the burns.
Doctors kept Wiens in a medically induced coma for 90 days. In March 2011, he received a new face in a 15-hour procedure at Brigham and Women's Hospital.
"When I woke up, and I was able to feel I had features again -- eyes and a nose and a mouth -- I even said out loud that this could not be medically possible," Wiens said in May 2011. "But here I am today."
Wiens recently married Jamie Nash, a woman who suffered burns on more than 70% of her body after a car crash.
"Our love is deep and strong, and together we will achieve greatness," Nash wrote on the Jamie Nash TXT L8R Foundation website.
Surgery: April 2011
Mitch Hunter suffered significant injuries in a 2001 car accident, in which he received a severe shock from a high-voltage electrical wire.
The Indiana man was the second full-face transplant recipient in the United States.
A 14-hour surgery gave Hunter a nose, eyelids and facial animation muscles and nerves, Brigham and Women's Hospital said.
In most of his face, Hunter now has near-normal sensation. His speech has continued to improve.
"Mitch reports that he is very happy with both the aesthetic and the functional outcomes of his operation, and enjoys spending as much time as possible with his family and friends," the hospital said in a statement. "He recently has taken on active pursuits, including running and training for endurance races. He also has a job in his home state of Indiana and is planning to obtain a degree in information systems."
Surgery: May 2011
Charla Nash was mauled by a friend's chimpanzee, leaving her without a nose, eyelids, lips or hands. Brigham and Women's Hospital surgeons performed a full facial transplant in a 20-hour procedure.
Initially, she also received two new hands through transplantation as well. A few days later, though, Nash became sick, and the hands were removed.
The first post-surgery pictures of her were released in August 2011.
She said at that time: "I will now be able to do things I once took for granted ... I will have lips and will speak clearly once again. I will be able to kiss and hug loved ones. I am tremendously grateful to the donor and her family."
Richard Lee Norris
Surgery: March 2012
Richard Norris from Virginia was a gun accident in 1997 that took away much of his upper and lower jaws, in addition to lips and nose. He needed a trachea tube to breathe. He wore a surgical mask for 15 years, hiding his deformities from the world.
A team of specialists at the University of Maryland Medical Center performed the procedure, which lasted 36 hours. The surgery involved replacing both jaws, as well as tongue, and skin and underlying nerve and muscle tissue, and an entire set of teeth. Essentially, his entire face was replaced except for his eyes and the back remnant of his throat.
Doctors said Norris' was the most extensive surgery of its kind.
Norris said in a statement in October, "I am doing well. I spend a lot of my time fishing and working on my golf game. I am also enjoying time with my family and friends."