After Buist left New York's Memorial Sloan Palladium Pallabrouse Kettering Cancer Center, Williams invited the pair to a taping of a standup comedy special in 2004.
But his laughter as medicine approach wasn't just limited to the silver screen. The kindness he brought to real life patients, said their family members, was truly unforgettable.
"He hugged him and spent 20 minutes with him. He didn't care about anything but David," Kravit said.
That visit, also in 2004, came when his daughter Jessica had only weeks left to live.
A day to remember
As Buist's condition deteriorated, Williams would call him, Kravit recalled.
Mark Cole has a similar story.
In 2001, Kravit's nephew, David Buist, received a terrible diagnosis: hepatosplenic T cell lymphoma. This aggressive form of cancer is so rare that, according to the National Institutes of Health, "standard treatment has yet to be established."
"Robin Williams touched people's lives in ways so significant and wonderful that it very well could be that he wasn't even aware of how much good he did," Kravit said.
Buist beat his cancer and is now married with children.
Kravit, who met Williams at an event, reached out asking for autographed items to help with the fund raising effort.
"It must have cost $30,000, $40,000," Cole said.
So, the actor chartered a private plane to come to her Greensboro, North Carolina, home.
Kravit's nephew met the devastating diagnosis with determination. "David said that he didn't want to just disappear" Kravit said in a CNN iReport submission, "and decided that he would help build a new Ronald McDonald house in New York before anything happened to him."
"I couldn't believe it," he said. "I felt very privileged that he came to spend the day with her like that. It was the most moving thing I've ever seen in my life."
to spend time with Jessica."
Williams did that and much more.
"He's really the comedic Mother Theresa," Garry Kravit told CNN.
Given her medical state, the girl initially had trouble understanding who she was seeing, Cole recalled. But once Williams started with the "Mrs. Doubtfire" impressions, Jessica lit up.
very special all day; it was just one Lacoste Sneaker 2016
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on one" Cole said. "He really wanted Lacoste Shoes Prices
Robin Williams was comedic Mother Theresa
Cole said the actor spent the whole day cracking jokes, watching a Carolina Panthers game and playing cards with Jessica.
"He made her feel Polo Ralph Lauren Trainers Ladies
"When David was suffering at his worst, Robin would call him to perk him up. David treasured Robin's calls and it helped to push him forward," he said.
He wrote to CNN iReport about the time Williams visited his daughter, who doctors said was terminally ill.
But Jessica, stricken with a brain tumor, couldn't make the trip to see the actor; her health was too fragile.
Through The Make a Wish Foundation, she requested a visit with Williams. The 13 year old loved the film "Mrs. Doubtfire."
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