<human>:  Why is it that the author, Dr. John Gottman, is a renowned marriage researcher?
<bot>: Dr. Gottman is a renowned marriage researcher because he is a renowned marriage researcher. He is a psychologist who studies relationships, and he has been studying relationships since the 1970s. He has published numerous books and articles about marriage and relationships, and has conducted research on couples. He has a Ph.D. in psychology from the University of Washington, and he has been married to his wife, Julie, for over 30 years.