Rockefeller was allowed supervised visits with his daughter. On Sunday afternoon, when the alleged kidnapping took place, the child and her mother were in Boston from their current home in London so that Rockefeller could see his daughter.
Rev. Marsh said that Rockefeller was "very involved and loving toward his daughter."
"The Clark that I knew was very affable and friendly," he said in an interview with ABCNews.com. "There was nothing that was evident that would have been considered terribly unusual. He was very solicitous toward his daughter."
Marsh described Reigh as "an extremely bright, engaging child."
"She was friendly, very curious; really a wonderful little girl," he said.
In the hours after the alleged kidnapping, Sandra Boss did not request an Amber Alert, telling Boston police that her ex-husband "wouldn't hurt a fly,'' and added that she did not think Reigh "was in any danger," the Boston police official said.
But the Massachusetts State Police broadcast an Amber Alert for the girl after her mother admitted that Rockefeller "had a tendency to be mean to the girl when she was bad,'' the source said.
Ordinarily, Massachusetts officials do not use the Amber Alert system for custodial kidnappings, but after the social worker was injured trying to stop the SUV that snatched up the child and her father, investigators agreed that there should be a statewide manhunt for Rockefeller and his daughter, said BPD spokeswoman Elaine Driscoll.
"There was someone injured, and there was obviously a very elaborate plan, so we thought it was appropriate to use the Amber Alert system,'' Driscoll said. New York City Police declined to broadcast an Amber Alert, even after Rockefeller was reportedly spotted at Grand Central Terminal.
Boston Police, along with FBI agents and State Police investigators, have set up a command center in the BRIC intelligence unit at BPD headquarters to handle the phone calls that have flooded in from tipsters, Driscoll said.
Rockefeller is a former board director of the Algonquin Club of Boston, a private dining club founded in 1888 that is just blocks from where the alleged kidnapping took place. Lassaad Riahi, the general manager at the Algonquin Club, told ABCNews.com that Rockefeller resigned his membership from the club three months ago "on his own terms."
Sandra Boss, the child's mother, is a senior partner in the London office of McKinsey & Company. She has done consultant work for New York Sen. Charles Schumer and New York City Mayor Michael Bloomberg, and has ties to the Metropolitan Museum of Art in New York and the Museum of Fine Arts in Boston.
A message left by ABCNews.com at the Four Seasons hotel, where police say Boss and her daughter were guests, was not returned Monday. Boss has since checked out of the hotel.
Alison Goodwin, a spokeswoman for the Massachusetts Child Welfare Agency, told ABCNews.com that the department has had previous interactions with the Rockefeller family.
Reigh is 4 feet tall, weighs 50 pounds and has blond hair and blue eyes. She was last seen wearing a pink-and-white sun dress and red shoes.
Clark Rockefeller is 5 feet 6 inches tall with a stocky build, thinning blond hair and blue eyes. He was last seen wearing a blue Lacoste shirt and khaki pants.