Dr. John M. Gottman has trained many marital counselors from Calgary and around the world. I have met a good number of them and they all praise his work. Gottman is described as North America’s most knowledgeable researcher in the area of successful marriage. Yet, I suggest you consider his concepts as described here to be useful in a broader context as in relationships in general. In The Seven Principles for Making Marriage Work: A Practical Guide from the Country’s Foremost Relationship Expert, he describes his finding after following over 700 couples in seven different studies.