The personal pronoun in formal writing
Formal writing is almost always written in the third person.In formal writing, do not insert yourself (first person) or the reader (second person) into the topic at hand. The personal pronouns I, me, my, mine, myself, ourselves, you, your, and yourselves should not appear in a formal paper. If you must include the writer or reader, consider using the third person (the author, this researcher).

Though the purpose of much formal writing is to put forth an opinion, avoid stating a personal opinion — even in the third person. Statements such as I think and we believe erode the objectivity that formal writing is expected to maintain. Remember to use facts and supporting evidence rather than personal opinion.