An author's name should stand on its own - there is no need to say, "Jane Smith, Ph.D." or "The psychotherapist Jane Smith" or "Jane Smith, who is well known in the field of psychotherapy." There is no easy way to check for this except to carefully read your manuscript or have someone else check this for you. The reasoning behind this rule is to not portray one author as more important/educated/respected than any other. The fact that they are being used as a source in a graduate level manuscript is enough to let your reader know they are knowledgeable and respected in their field.