The Psychology of Human Relationships. Grove Press, 1964.
Parallax, 2014.
The Secret to Love That Lasts. Northfield Publishing, 1992.
Get Unstuck, Embrace Change, and Thrive in Work and Life. Penguin Random House, 2016.
How to Create Deep and Lasting Intimate Relationships. Sounds True, 2019.
Navigating the Complicated New Landscape. Harper, 2016.
When the People in Your Life Use Fear, Obligation, and Guilt to Manipulate You. HarperCollins Publishers, 2001.
The No-Excuses Truth to Understanding Guys. Simon and Schuster, 2004.
Patterns, Proofs, and the Search For The Ultimate Equation. Simon & Schuster, 2015.
Say Goodbye to Loneliness and Discover Deeper Connection. Amazon, 2018.
The Art and Science of Staying Together. Random House, 2019.
Simple Ways to Keep the Little Things from Taking Over Your Life. Hyperion Books, 1997.