Marshall Hollister has first been mentioned in the fifth book of Dork Diaries. He is the owner of Hollister Holdings, INC., which Nikki Maxwell's father used to work for. Although not many details are shared about Hollister Holdings, it appears to specialize in owning property and exterminating. He also appeared with Miss Hollister in Dork Diaries 9: Tales from a Not-So Dorky Drama Queen when MacKenzie asks to transfer to another school.
- He is an entrepreneur.
- Unlike his daughter MacKenzie and his wife, he seems to be quite friendly.
- He used to be Mr. Maxwell's boss.