A doctor who lets his patients spray his hair green in support of the Milwaukee Bucks took to Twitter on Tuesday to call out rapper/singer Drake.

David Margolis, program director for bone marrow transplants at Children's Hospital of Wisconsin and a professor at the Medical College of Wisconsin, has been changing his hair for years in support of the Milwaukee Bucks.

Drake, who is Canadian, is a huge fan of the Toronto Raptors, the Milwaukee Bucks' opponent in the Eastern Conference Finals.

Margolis admits he doesn't listen to songs from the "In my Feelings" singer but knows he has a "heart of gold."

One of his children tried to school him in all things Drake.

"Drake and I both had a bar mitzvah, and he visited other children hospitals," Margolis said.

He tweeted to Drake on Monday in advance of the Eastern Conference Finals, which begin Wednesday at Fiserv Forum. Drake is often courtside during Raptors games in Toronto.

"Hey @drake, besides being two “super fans”, we will both celebrate Shabbat @FiservForum. While in MKE for @bucks vs @raptors we invite you to @childhealthwi & our kids can color your hair red as they paint my hair green. Maybe the kids @SickKidsToronto can join the fun too!"

Margolis is not worried about fans, patients or Milwaukeeans being upset over the opponent's shade of red.

"I'm a big fan of supporting your own home team; I think it will be fun," he said.

Margolis pointed out the mutual respect between the two teams and between Children's Hospital and The Hospital for Sick Children in Toronto.

He already has a teen patient who volunteered to spray Drake's hair red. The patient hasn't been feeling well lately and has had a rough go. Margolis said her eyes lit up when she heard about the tweet.

"Her disposition changed in an instant. She said she wanted in on the Drake thing," he said.

He warned her Drake might not come through, but the patient said it was still fun, regardless of the outcome.

Another patient, Kendra Koepp, said it is amazing how much Margolis does to get the word out on The MAAC Fund and the hospital. She said the hospital can be a dark place given the different health issues of patients. Koepp said everyone at Children's Hospital does what they can to make everyone smile.

"It means a lot that we aren't just cancer kids but we get to do fun things such as painting his (Margolis) hair," Koepp said.

Celebrities make kids smile

At the heart of enticing celebrities to visit or donate to Children's Hospital is the goal of letting kids be kids.

"If we can get a celebrity who the kids know to paint hair together, they would love that," Margolis said.

In 2018, singer-songwriter Jason Mraz gave patients an impromptu concert.

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The doctor doesn't claim to be a Twitter expert but ever since the Rocks for a Reason challenge,which went viral, he has been a supporter of the social media platform.

"I tend to tweet mostly about the Bucks and other teams — and occasionally medicine," Margolis joked.

The Bucks fan also tweets about The MACC Fund and Children's and Froedtert & the Medical College of Wisconsin.

"For better or worse, I have a lot of Bucks fans followers," he said.

How the green came to be

The Milwaukee Bucks have traditionally paid visits to the Midwest Athletes Against Childhood Cancer Center (MACC Fund Center) at Children's Hospital of Wisconsin. Margolis would always ask the players about the team's playoff prospects. One year he decided to make a wager to allow patients to spray his hair green if the Bucks advanced to the playoffs — and the rest is history.

Margolis plans to rock the green hair for as long as the Bucks are in the playoffs, which he hopes ends with an NBA title in June.

It's no surprise Margolis takes his Bucks passion to the hospital. In a video posted to the Milwaukee Bucks' YouTube page through Gruber Law Offices in 2016 titled "Always a Buck," Margolis said his passion for the Bucks began when he was a child.

In the video, he said his grandfather owned a parking lot many Bucks legends used, including Kareem Abdul-Jabbar, Jon McGlocklin and Oscar Robertson.

"Living the American dream," Margolis said. "Grandpa ran a parking lot, and his grandson is a physician that works with and for the MACC Fund."

The MACC Fund, which raises money for childhood cancer and related blood disorder research, was founded by McGlocklin and Eddie Doucette, the first official voice of the Bucks, in 1976. The fund, whose first major sponsor was the Bucks, has raised more than $65 million since its inception.

As of Tuesday afternoon, Drake hadn't replied or retweeted Margolis.

The doctor is even offering to rap for Drake. Although not musically skilled, he would give it a go for patients at Children's Hospital and The Hospital for Sick Children.

"Whatever it takes to keep the kids happy," Margolis said.

How are you showing the Bucks some love? Contact Karen Pilarski at karen.pilarski@jrn.com. Follow her on Twitter at @KarenPilarski.