Research: Who Makes Title Sequences?

To find out who was behind the title sequences of many films, I headed over to www.watchthetitles.com and watched this video:

From this, I learned that there are specific people who are hired to design title sequences and that there are many different approaches to making title sequences and different components. Their ideas are a combination of both their own as well as the director's as the director has the last say (before the studio).