|Occupation(s):||Producer of the Platinum Music Awards|
|Family & Friends|
|Family:||Francis Thornesmith (son)|
|Friends:|| Tori Vega|
|First appearance:||Tori Goes Platinum|
|Last appearance:||Robbie Sells Rex (on-screen) The Bad Roommate (mentioned)|
|Portrayed By:||Charles Shaughnessy|
He first appeared in Tori Goes Platinum where he held a contest to determine who would sing the opening number. After enduring multiple terrible audition tapes, he eventually found Tori Vega's and chose her as his new star. However, in doing so, he also forced Tori to reinvent herself into a diva causing her, two days before the show, to quit prompting Mason to replace her with Jade West upon whom he foisted the same arbitrary rules, seemingly causing her to lose any enthusiasm she might have had even faster than Tori. Before Jade was due to go on however, her conscience won over and she returned the spot to Tori. Though Mason was surprised and angry by this, he quickly changed his tune when he saw how successful and popular Tori was, taking her on but letting her remain as herself.
Mason returns in The Bad Roommate, now on much better terms with Tori, speaking in the Blackbox Theater at her request. Though Tori had intended for Mason to inform her peers about the music industry, he took one look at the crowd and promptly told them that none of their dreams would ever come true. When Robbie and Rex made themselves known, Mason invited them to Neutronium Records, with Robbie assuming it was to discuss a record deal, so his son, Francis Thornesmith, could buy Rex from Robbie. The episode also reveals that Tori has been coming to see Mason more and more frequently, as he's on a first name basis with Cat, even going so far as to forbid his assistants from giving her more bibble.
- He tends to be picky and critical about the performances at Hollywood Arts. Like everyone else, he didn't like Trina's performance and said: "What have I ever done to deserve this torture?", and when he was watching Rex's performance he looked as though he was saying, "What the...?" Indeed like most people in the series, he seems to regard Tori as the only talented student at the school.
- Though he remembers Tori and Cat in Robbie Sells Rex, he seems to have forgotten about Jade.
- Mason is British, but his son Francis speaks in an American accent. Mason and his wife could have moved from Britain to America before Francis was born.
- He claims he "never wanted to have kids."
- He seems very fond of bibble but, unlike Cat, is not addicted to it.