Rosianna Halse Rojas (born 15 August 1991) is a writer, video blogger, social media manager and online personality. Rojas is best known for being vlogger and novelist John Green's personal assistant. On having this position, Green has written, "She is often called my assistant, but she does many things—from project management to helping shape the strategic direction of our educational and charity projects." Rojas is also a literary critic.
Rojas attended Tiffin Girls' School, prior to her enrolment at the University of Exeter where she studied English with Study in North America. Rojas attended Vassar College for the second year of this course. Although formerly living in London, Rojas now resides in Indianapolis.
She began building a presence on YouTube in 2006, when she registered her account under the username missxrojas. On the account, she would post vlogs about Harry Potter, intellectualism and her personal school life as she studied for GCSE and A Level exams, among other topics.  Her videos attracted an audience, and she developed a presence in the Nerdfighteria community. Eventually, in March 2013, Rojas became John Green's personal executive assistant. John Green is one of the two brothers who form the VlogBrothers, a vlogging channel created by the Green brothers, which sprung up the Nerdfighteria community. She would also give a TED talk at TEDx Brighton. She was one of 16 vloggers to be recognised by YouTube's Next program in 2012.
In addition to being John Green's PA, Rojas has been described as "a pioneering nerdfighter," by The New Yorker. In 2013, Rojas was one of six fill-in hosts for Green on the VlogBrothers channel, while Green was on paternity leave. Rojas has also served as the editorial director of Leaky News, a Harry Potter fansite.
Aside from being involved in Nerdfighteria, Rojas is a personality in YouTube's female community; Rojas identifies as a feminist. Rojas was the moderator of the Sexism on YouTube panel at VidCon 2014. In this field, Rojas has also designed "The Ladies Survey", an online survey about women and the internet. Rojas is also credited with being a writer on the humanities-related courses (world history, literature, US history) on Crash Course.
After signing a first-look producing deal with Fox 2000 and Temple Hill Entertainment, Green hired Rojas as a producing partner. Their currently unnamed production company is working with Fox 2000 to produce a film about AFC Wimbledon, a third-tier English soccer team.
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