Use the pronoun that matches the person’s authentic gender. A person who identifies as a certain gender, whether or not that person has taken hormones or undergone surgery, should be referred to using the pronouns appropriate for that gender. If you are not certain which pronoun to use, ask the person, “What pronouns do you use?”
(Source: GLAAD Media Reference Guide)

If a person uses pronouns that are not familiar to most readers (such as xe or ze) or may grammatically confuse readers (such as they/them/theirs), include an explanation on first reference if you plan to use the pronouns in subsequent references. For example: Joe Smith, who uses they/them/theirs pronouns … 

When listing preferred pronouns, separate them with a forward slash and no spaces: he/him/his, she/her/hers, they/them/theirs