[7] Mull served a two-year mission for The Church of Jesus Christ of Latter-day Saints in Chile.

[8] Mull has worked as a comedian, a filing clerk, a patio installer, a movie promoter, a copywriter, and briefly as a chicken stacker.

A wizard named Agad decides to seek out Grandpa Sorensen for help, and in the process Kendra and Seth.

A prequel called Legend of the Dragon Slayer was published between the fourth and fifth books.

Beyonders is a series about a teenage boy named Jason who gets summoned as the last chance to save Lyrian, a doomed realm ruled by the wizard Maldor.

Five Kingdoms is a series about a 12-year-old boy named Cole who was about to get enslaved by slave traders but at the last moment, he hides while his friends are being sucked away to another world called the Outskirts.

[14] Brandon Mull spearheaded a multi-book series called Spirit Animals.

Mull also contributed to True Heroes: A Treasury of Modern Fairy Tales, a short story anthology inspired by real children with cancer.