Editor's note. Raymond P. Lorion served as action editor for this article.Author's note. Writing this article has been an odyssey. My deepest thanks go to the many colleagues and friends who have supported me during my labors. In particular, I would like to thank Frederick J. Wertz, without whose encouragement, assistance, and impeccable scholarship this article may not have come to pass. I would also like to thank

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Finally, specific recommendations are provided to further enhance and expand the impact of HP research for clinical training programs and the development of treatment guidelines.

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This article provides an overview and case application of the existential-integrative (EI) approach to psychotherapy. I developed the EI approach based on the existentialhumanistic work of Rollo May and James Bugental. In the first section of the article, the EI approach is introduced and described with a particular focus on its central and evidence-based principles. In the second section of the article, a therapeutic case is provided to illustrate the principles of the EI approach. In the final section of the article a discussion of the findings is interwoven with a call for greater attention to EI practices among integrative theorists, researchers, and practitioners. It is concluded that for their optimization, the existential bases of all bona fide therapies may be foundational.