John Green tells the Boston Globe in Sunday's edition that he received a phone call about the transplant, but says he doesn't know any other details about the donation.
He says the call "really lifted" his spirit and says he and his wife are proud parents once again of their daughter, "who has done another amazing thing."
The Globe reports:
Green said his family would love to meet the little girl Christina helped.
"We would love to meet her and her family," he said. "I don't know if that's something that they wish to do, but I know I talked about it with my wife and my son, and if there's a day that would be appropriate, we would love to meet them."
Nine-year-old Christina Taylor Green was born Sept. 11, 2001.
She had just been elected to her Tucson school's student council, which is why she went to see Rep. Gabrielle Giffords.
A spokesman for the New England Organ Bank tells the Globe he can't comment on donations.
And a friend helping the Green family said they received a call yesterday from the organ donation network, telling them that Christina-Taylor's donation had already saved the life of a child on the East Coast.
The little girl loved ballet, gymnastics and baseball, the only girl on her team.