The Man with the Yellow hat (aka Ted Shackleford) is a major character in all of the Curious George Trilogy set and TV series.
He's George's monkey father (parent) and a guardian and treats him like his own child. Based on the movie, the man with the yellow hat (Ted) got his yellow suit and hat from an explorer's shop.
However, in the TV series he revealed to treasure of his hat and lets out a high pitched scream when his hat gets ruined (in Curious George and the Trash)! There is also many instances and references to the man having his yellow hat as a child, attributing the way he got his yellow suit in the movie to Hollywood, less than the true story. When Seymour roars loudly, Ted, after being ambushed, leads out a high pitched whimper, happened in Curious George 3: Back to the Jungle.
One of the Man with the Yellow hat's key traits is that he is single. In the books and the episodes, he lives in a small apartment alone with George and has romantic relationships. However, in 2 films, he is shown to have his girlfriend; Maggie Dunlop who is a schoolteacher (But technically she was been hit by a semi city bus after rescuing George during the wedding celebration in the upcoming film; Curious George 4).
In Ted's Great Adventure (upcoming) film, in the post credits scene Ted first time meets Maggie's college friend; Tara in South Africa after reuniting George, before meeting Nelson, and grew in love for the first time.
The Man with the Yellow hat's job is widely disputed. In 2 movies, he is shown to work at the Bloomsberry Museum first as a worker then a director. For the episodes, he helps Professor Wiseman but doesn't appear to earn any money from it. It's also shown he takes the subway to work. However, on "Curious George's Egg Hunt" The Man in known as an herpetologist.
The key item related to the man with the yellow hat is, of course, his yellow hat! Other items of his usual attire choices (clothes) include his yellow long neck shirt, yellow pants, and a tall pair of brown boots.
In the 2006 film, his original museum uniform consists of a white T-shirt, cream vest, brown pants, and dark brown shoes.
In Curious George 2, The Man's pajamas and his swimming trunks are red, but now in PBS Kids TV Series and Curious George 3, his pajamas are yellow (as usual).
In Curious George 3 in the ending credit photos, Ted drove in his yellow car (same from the PBS Kids TV Series), along with George, to show Naja Kulinda, Stirch and Seymor around the city to see all the sights.