Mullenweg has studied a wide range of subjects. For example, he studied jazz saxophone when he was a student at a high school that specialized in the arts. Then, Mullenweg went on to study Political Science at the University of Houston before dropping out to pursue a career at CNET Networks.
In 2003, Mullenweg and Mike Little decided to collaborate on making a successor to a blogging tool called b2/cafelog, which went on to become WordPress. It is interesting to note that the two soon managed to get help from Michel Valdrighi as well, which was important because he was the original developer for b2/cafelog.