Who makes title sequences?

There are hundreds of people that make title sequences, for example Saul Bass created a lot of title sequences, he was a graphic designer and designed a title sequence for 'The man with the golden arm' in 1955. He had a lot of ideas because he worked for Hollywood's greatest film-makers and because he was a graphic designer he chose to be more visual than anything else and his graphic skills helped him accomplish that.

Another designer is Onur Senturk, Onur has worked at Prologue Films, collaborating with Kyle Cooper and Danny Yount. He produced concept and typography designs for the opening titles of The Girl with the Dragon Tattoo at Blur Studio. Blur Studio was founded in 1995, Blur provides animation, effects, and design for a wide range of media including feature films, marketing, commercial advertising, digital platforms, large format films, concept art, game cinematics, broadcast, and branding. Notable clients have included ABC, Disney, Universal Pictures, CBS, Microsoft, Electronic Arts, Paramount Pictures, 20th Century Fox, Sega, Activision, Nickelodeon, FOX Sports and THQ, among others.

Imaginary Forces is a design-based production studio with offices in Hollywood and New York.

 Founded in 1996, Imaginary Forces has created the main titles for films such as Se7en, Mission Impossible, Mad Men, Boardwalk Empire, all three Transformers films, 500 Days of Summer, and others.