Rosianna Halse Rojas
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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.

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.