Answer by taking a quote from the following article:

Justin Randall Timberlake was born on January 31, 1981 in Memphis, Tennessee, to Lynn (Bomar) Harless and Charles Randall Timberlake, a Baptist church choir director. Timberlake grew up in Shelby Forest, a small community between Memphis and Millington. He has two half-brothers, Jonathan (born September 12, 1993) and Stephen (born August 14, 1998), from Charles' second marriage to Lisa Perry. His half-sister Laura Katherine died shortly after birth on May 12, 1997, and is mentioned in his acknowledgments in the album NSYNC as "My Angel in Heaven".

Timberlake has co-owned or provided celebrity endorsement for three restaurants in the United States: "Chi" opened in West Hollywood, California in 2003, and "Destino" and "Southern Hospitalty" in New York opened in 2006 and 2007, respectively. In 2005, Timberlake launched the William Rast clothing line with childhood friend Juan ("Trace") Ayala. The 2007 line contained cord jackets, cashmere sweaters, jeans, and polo shirts. The pair reports inspiration from fellow Memphis native Elvis Presley: "Elvis is the perfect mixture of Justin and I," Ayala says. "You can go back and see pictures of him in cowboy boots and a cowboy hat and a nice button-down shirt, but then again you can see him in a tux and a collared shirt with rhinestones on it and slacks. We like to think 'If he was alive today, what would he be wearing?'" Target has announced that a William Rast collection, including denim, outerwear and sportswear for men and women, would launch in December and be available for a month. In 2015, the clothing line earned him a Lord & Taylor's Fashion Oracle Award at the Fashion Group International's Night of The Stars Gala. An avid amateur golfer, in 2007 Timberlake purchased the run-down Big Creek Golf Course in his home town of Millington, Tennessee, which he redeveloped as the eco-friendly Mirimichi Golf Course at a cost of some $US16 million. It was reopened on July 25, 2009 but closed again on January 15, 2010 for further improvements expected to take six months. In October 2011, Timberlake received the Futures Award at the Environmental Media Awards for his green-conscious golf course. It was reported on November 7, 2014, that Timberlake had sold Mirimichi to Three Star Leasing LLC for $500,000. Timberlake and his wife Jessica Biel are minority owners of the Memphis Grizzlies.  Timberlake provides celebrity endorsement for many commercial products, this aspect of his business being managed by IMG since April 2008. Major endorsements in 2009 included Sony electronic products, Givenchy's men's fragrance "Play",  the Audi A1, Callaway Golf Company products, and in 2011, Myspace. In 2012, he hosted Walmart's annual shareholders meeting saying, "I buy a lot at Walmart."  In 2014, Timberlake partnered with Sauza Liquors to re-launch his own version of the beverage as part of the Sauza franchise: Sauza 901. In 2016, he became an investor in beverage company Bai Brands. In 2017, Tiger Woods and Timberlake acquired an ownership stake in the Hurricane Junior Golf Tour.

Why does he support them?
being managed by IMG