" Dr. William Glasser, M.D. is an American psychiatrist and the author of more than 25 books. In his book, Positive Addiction, Glasser states that most of us want happiness more than anything else in our lives. We get that, he says, through love and worth; that is, by loving and being loved, and doing something we believe is worthwhile. However, when we don’t have these, we experience some degree of misery, pain and failure instead.