He authored over 150 articles and more than 20 books, which have been translated into at least eight languages. Individual Behavior: A New Frame of Reference for Psychology (Snygg & Combs, 1949) provided the foundation for his perceptual-experiential theory of therapy, which he later detailed in A Theory of Therapy: Guidelines for Counseling Practice (Combs, 1989). He continually and dynamically translated his theory and research to contemporary practice. For example, Helping Relationships: Basic Concepts for the Helping Professions (4th ed.; Combs & Gonzalez, 1994) was originally published in 1971. Being and Becoming: A Field Approach to Psychology (Combs, 1999) provided a synthesis of his theory. The Association for Supervision and Curriculum Development published books related to education, such as On Becoming a School Leader: A Person-Centered Challenge (Combs, Miser, & Whitaker, 1999).