Overview

Harris L. Friedman has spent more than four decades developing transpersonal psychology as a scientific field. His work addresses a central tension in the discipline: how to study subjective, often extraordinary human experiences (spiritual states, anomalous cognition, self-transcendence) using rigorous empirical methods without reducing them to neurobiological reductionism or abandoning them to unfalsifiable metaphysics. Rather than choosing between scientism and romanticism, Friedman has advocated for what he calls “good science” in transpersonal work: empirically testable middle-range theories that bracket supernatural claims while remaining open to genuine anomalies.

His contributions span three interconnected domains. First, he developed the Self-Expansiveness Level Form (SELF), an instrument designed to measure transpersonal identification, the sense of self extending beyond individual boundaries across time and space.¹ This construct has become foundational in empirical transpersonal research, allowing investigators to correlate self-expansiveness with environmental behavior, attitudes toward near-death experiences, and other measurable outcomes. Second, he has served as a conceptual architect and editor, shaping the International Journal of Transpersonal Studies into a venue for quantitative and methodologically sophisticated work. Third, he has engaged directly with parapsychology, arguing that the two fields (transpersonal psychology and parapsychology) share enough theoretical and empirical common ground that closer collaboration could strengthen both.

Throughout his career, Friedman has maintained a critical stance toward what he terms “romantic scientism”, the uncritical embrace of exotic spiritual traditions, the privileging of qualitative over quantitative methods, and the use of pseudomathematical reasoning to lend false precision to unfalsifiable claims.¹¹ At the same time, he has resisted pure materialism and conventional naturalism, arguing that neurobiology and transpersonal psychology can be reconciled through theoretical development that does not assume consciousness is reducible to brain function.⁶

Life and career

Friedman’s career trajectory reflects a deliberate movement from clinical practice toward theoretical and editorial leadership in transpersonal studies. He held positions at Walden University, Saybrook University, and the University of Florida, where he served as Research Professor of Psychology before retiring. His most sustained institutional role has been with the International Journal of Transpersonal Studies, where he served as co-editor and senior editor, shaping editorial policy and commissioning special topic sections on quantitative methods, syncretism, transpersonal psychotherapy, and the relationship between parapsychology and transpersonal psychology.

Early in his career, Friedman developed the Self-Expansiveness Level Form (SELF) as a measurement tool for transpersonal identification.¹ This instrument became central to his subsequent empirical program. Rather than relying solely on qualitative reports of spiritual experience, the SELF allowed researchers to quantify the degree to which individuals experienced their sense of self as extended beyond conventional ego boundaries. This methodological innovation positioned Friedman as a bridge figure between transpersonal psychology’s phenomenological roots and the quantitative rigor demanded by mainstream psychology.

Throughout the 1990s and 2000s, Friedman published extensively on the philosophical and methodological foundations of transpersonal psychology as a science. He argued that the field had been hampered by an overemphasis on grand theories, sweeping metaphysical systems that attempted to explain everything but generated few testable predictions, and mini-theories that were so narrowly focused they contributed little to cumulative knowledge.⁴ Middle-range theories, by contrast, could bracket metaphysical and supernatural assumptions while remaining empirically generalizable. Self-expansiveness exemplified this approach: it was a transpersonal construct (it concerned the expansion of identity beyond conventional boundaries) yet it was measurable, correlatable with other variables, and amenable to replication across samples.

Friedman’s editorial work at the International Journal of Transpersonal Studies reflected these commitments. He commissioned special sections on quantitative research methods, explicitly addressing the field’s historical resistance to statistical and experimental rigor.¹² He also worked to integrate parapsychology and transpersonal psychology, recognizing that both fields studied anomalous human capacities and that theoretical and methodological cross-pollination could benefit both. In 2010, he co-edited with Stanley Krippner the volume Debating Psychic Experience: Human Potential or Human Illusion?, which brought together prominent voices from both parapsychology and transpersonal psychology to examine their commonalities and differences.¹³

In his later career, Friedman became increasingly critical of what he saw as unwarranted romanticism within transpersonal psychology. He documented the field’s tendency to privilege non-Western and indigenous spiritual traditions while dismissing Western religious frameworks, a bias he termed “xenophilia.”⁹ He also raised important cautions about persistent self-transcendence, arguing that while self-transcendent states are often celebrated as markers of spiritual development, their persistence as enduring traits can produce significant psychological difficulties including dissociation, depersonalization, and disruption of narrative memory.⁷ This work exemplified his commitment to critical rigor: transpersonal psychology, he argued, must be willing to examine the potential harms of its own practices and ideals.

Research

Self-expansiveness and transpersonal identification. Friedman’s foundational contribution was the development of the Self-Expansiveness Level Form (SELF), an instrument designed to measure the degree to which individuals experience their sense of self as extended beyond conventional ego boundaries.¹ This construct became central to his empirical program. In a study examining the relationship between interconnectedness and environmental behavior, Friedman and colleagues found that the SELF-Transpersonal Scale (SELF-TS) significantly intercorrelated with domain-specific measures of connectedness to nature and consideration of future consequences, suggesting that all three measures tap a common underlying construct of interconnectedness.² However, the study also revealed important nuances: while specific indicators of feeling interconnected with nature and the future predicted environmental behavior, the broader transpersonal measure of self-expansiveness did not, suggesting that transpersonal identification operates differently from domain-specific connectedness.

In another empirical application, Friedman and colleagues examined the relationship between transpersonal self-concept and psychologists’ knowledge of and attitudes toward near-death experiences (NDEs). Using the SELF-TS alongside the Near-Death Phenomena Knowledge and Attitudes Questionnaire, they found that two of three attitude scales correlated significantly with transpersonal self-concept scores, suggesting that psychologists with higher transpersonal identification held more favorable attitudes toward NDEs.³ This work demonstrated that the SELF could serve as a predictor variable in studies examining how transpersonal orientation relates to openness toward anomalous phenomena.

Middle-range transpersonal theories. Friedman’s theoretical work centered on the argument that transpersonal psychology had been impeded by an overemphasis on two extremes: grand theories that attempted to explain everything and mini-theories that explained very little. Middle-range theories (positioned between these extremes) offered a more productive path for cumulative empirical research.⁴ Such theories bracket metaphysical and supernatural approaches common in grand transpersonal theories while accepting the possible generalizability of findings commonly rejected by mini-theories. Self-expansiveness exemplified this approach: it was a transpersonal construct, yet it was measurable, correlatable with other variables, and amenable to replication. Other constructs, such as awe, could similarly serve as candidates for building and testing middle-range transpersonal theories.

Transpersonal psychology and parapsychology in dialog. Friedman engaged directly with parapsychology through collaborative work with Dean Radin and Stanley Krippner. In a 2022 paper, Friedman, Radin, and Krippner examined the historical separation of parapsychology and transpersonal psychology, noting considerable overlap in both content and researcher interests.⁵ They explored ways the two movements could be brought into better alignment, such as including more transpersonal approaches within parapsychological studies and vice versa. In an earlier collaborative work with MacDonald, Friedman examined how neurobiology might resolve longstanding tensions between the two fields, identifying theoretical problems such as conventional assumptions about scientific naturalism and materialism that potentially undermine substantive advances in understanding anomalous phenomena.⁶

Transpersonal clinical supervision. Friedman extended transpersonal psychology into clinical practice through work on transpersonal approaches to clinical supervision. He argued that transpersonal psychology can provide unique approaches to clinical supervision by offering an interconnected, self-expansive view of the self across time and space, and can provide a secular avenue to consider the importance of spirituality without relying on supernatural assumptions.⁸ Transpersonal supervisors can challenge conventional notions about what and how supervisees know, and even the nature of being a knower, through providing a more inclusive, holistic vantage that is both critical of mainstream approaches and surpasses their ability to provide a coherent “super” (going beyond the usual more-myopic understandings) vision.

Persistent self-transcendence and its side effects. In later work, Friedman and Stephens documented the potential deleterious side effects of persistent self-transcendence, when self-transcendent states become enduring traits rather than transitory experiences.⁷ Drawing on case reports and empirical evidence, they showed that people can suffer emotional difficulties, motivation changes, loss of self-reflexivity, anhedonia, dissociation, depersonalization, and memory problems when self-transcendence becomes persistent. This was discussed in terms of the disruption of the sense of self, which ordinarily serves as an integrative center for the person that conveys a sense of agency. The work also reviewed evidence on problematic side effects of meditation and mindfulness, techniques commonly presented as paths to persistent self-transcendence. Given that persistent self-transcendence is often presented as a pinnacle of human development and spiritual attainment, Friedman and Stephens urged seekers, psychologists, and mental health professionals to become informed about its possible side effects and view this phenomenon in a more balanced way.

Xenophilia and cultural bias in transpersonal psychology. Friedman identified and critiqued a systematic bias within transpersonal psychology: the tendency to privilege so-called exotic religious and spiritual traditions over Western frameworks, a phenomenon he termed “xenophilia.”⁹ This bias parallels the xenophobic tendency within mainstream Western psychology of religion to privilege the Judeo-Christian tradition. Friedman challenged claims made in major psychology journals that Buddhism does not rest on supernatural faith and is the most psychological spiritual tradition, presenting demographic evidence of conversion rates to Buddhism in the US contrasted with conversion rates to Christianity in South Korea to illustrate the xenophilic tendency to embrace religious and spiritual traditions selectively.

Transpersonal approaches to conflict resolution. Friedman applied transpersonal frameworks to real-world conflict resolution. In work on the conflict in Fiji, he presented reframing as a psychological technique applicable to facilitating change leading to conflict resolution and peace.¹⁰ While Fijian problems had commonly been attributed to racial and ethnic divides, Friedman proposed an alternative understanding: that they were better seen as due to competing economic models. The scientific transpersonal perspective was presented as another alternative framework, especially applicable to religious conflicts, which potentially provided an inclusive way to reconcile differences. He concluded that reframing might be useful in a wide range of conflicts through providing integrative frameworks that change the level and content of divisive discourse.

Transpersonal psychology as science. Friedman’s most sustained theoretical contribution has been the argument that transpersonal psychology can and should develop as a science, distinct from the broader field of transpersonal studies, which may legitimately use scientific or non-scientific methods.¹⁴ He drew a distinction between transpersonal phenomena (experiences and capacities that can be empirically studied) and transcendent noumena, ultimate states or realities that lie outside the purview of science. He countered arguments from romanticism, scientism, and constructionism that challenged the possibility of a scientific transpersonal psychology, arguing that the scientific approach offers potential contribution toward providing a unifying paradigm for the discipline of psychology and for solving crucial problems in the world.

In a more recent paper, Friedman addressed the problem of pseudomathematics in transpersonal psychology, critiquing the use of Drake-like equations to estimate the mathematical likelihood of consciousness survival after death.¹¹ While welcoming quantitative work in a field historically dominated by qualitative research, he argued that combining probability guestimates to produce results that lack meaning constitutes pseudomathematics. He distinguished between good science (exemplified by self-expansiveness research), bad science (exemplified by the critical positivity ratio), and pseudoscience not-even-wrong (exemplified by astrology), raising important questions about the proper use and misuse of mathematics within transpersonal psychology.

Influence and reception

Friedman’s influence on transpersonal psychology has been substantial, operating through multiple channels. As co-editor and senior editor of the International Journal of Transpersonal Studies, he shaped the field’s methodological standards and editorial priorities. His commissioning of special sections on quantitative methods, syncretism, and the relationship between parapsychology and transpersonal psychology established new conversations within the discipline. The SELF instrument has become widely used in empirical transpersonal research, allowing investigators to measure and correlate self-expansiveness with environmental behavior, attitudes toward anomalous experiences, and other variables.

His theoretical work on middle-range theories has provided a conceptual framework for researchers seeking to balance scientific rigor with genuine engagement with transpersonal phenomena. By arguing that transpersonal psychology need not choose between grand metaphysical systems and narrow empirical studies, he created intellectual space for a more productive middle path. His critical work on xenophilia, persistent self-transcendence, and pseudomathematics has also established important cautions within the field, encouraging practitioners and researchers to examine potential biases and harms in transpersonal work.

Friedman’s collaborative work with parapsychologists, particularly his engagement with Dean Radin and Stanley Krippner, has helped establish parapsychology and transpersonal psychology as complementary rather than competing fields. His argument that neurobiology might resolve tensions between the two disciplines, and that closer theoretical and methodological alignment could strengthen both, has influenced subsequent work in both areas. His development of transpersonal approaches to clinical supervision has extended transpersonal psychology into applied clinical contexts, demonstrating that transpersonal frameworks can inform professional practice without requiring supernatural assumptions.

Within the broader field of psychology, Friedman’s work has contributed to the legitimacy of transpersonal psychology as a scientific subdiscipline. By consistently arguing for empirical rigor, methodological sophistication, and critical self-examination, he has helped counter the perception that transpersonal psychology is inherently unscientific or merely a vehicle for spiritual ideology. His insistence that good science in transpersonal psychology is both possible and necessary has influenced a generation of researchers working to study anomalous human experiences within rigorous empirical frameworks.