Professional Bio

Research Interests

Louis Castonguay ’s primary research interest is on different aspects of psychotherapy, including variables related to the clients, therapists, therapeutic relationship, treatment interventions, and training. Several of his studies have taken place in the context of Practice Research Networks, which are designed to foster researchers and clinicians’ collaboration in investigating psychotherapy as conducted in naturalistic settings.

Louis Castonguay's lab web page

Louis Castonguay's Vitae

Louis Castonguay's Research Program

Louis Castonguay's bio

Recent Edited Books

Practice-based evidence in the psychological therapies: Toward policy implications for research, training, and clinical guidelines. Edited by Louis G. Castonguay, Dana Atzil-Slonim,  Michael Barkham, and Wolfgang Lutz

Bergin and Garfield's handbook of psychotherapy and behavior change, 7th Edition
Edited by Michael Barkham, Wolfgang Lutz, and Louis G. Castonguay

Becoming better therapists: Advancing training and supervision in psychotherapy. Edited by Louis G. Castonguay and Clara E. Hill

Psychopathology: From science to clinical practice, 2nd Edition
Edited by Louis G. Castonguay, Thomas Oltmanns, and Abigail Powers Lott

Principles of change:  How psychotherapists implement research in practice Edited by Louis G. Castonguay, Michael Constantino, and Larry E. Beutler

Practice-oriented research in psychotherapy: building partnerships between clinicians and researchEdited by Louis G. Castonguay and J. Christopher Muran

Visions in psychotherapy research and practice
Edited by Bernhard M. Strauss, Jacques P. Barber, and Louis G. Castonguay

Transformation in Psychotherapy: Corrective Experiences Across Cognitive Behavioral, Humanistic, and Psychodynamic Approaches
Edited by Louis G. Castonguay, PhD; Clara E. Hill, PhD

Principles of Therapeutic Change that Work
Edited by Louis G. Castonguay and Larry E. Beutler

Insight in Psychotherapy
Edited by Louis G. Castonguay, PhD; Clara E. Hill, PhD

Bringing Psychotherapy Research to Life: Understanding Change Through the Work of Leading Clinical ResearchersEdited by Louis G. Castonguay, PhD; J. Christopher Muran, PhD; Lynne Angus, PhD; Jeffrey A. Hayes, PhD; Nicholas Ladany, PhD; and Timothy Anderson, PhD

Psychopathology: From science to clinical practice
Edited by Louis G. Castonguay & Thomas Oltmanns

How and why are some therapists better than others
Edited by Louis G. Castonguay, Ph. D. & Clara E. Hill, Ph. D. 

Selected publications

Chen, S. Z., Castonguay, L.G., Tan, H., & Scofield, B. E. (in press). Discrimination Predicts Session-by-Session Change in Suicidal Ideation for Clients in Outpatient Psychotherapy.  Journal of Consulting and Clinical Psychology

Davis, K.A., Castonguay, L.G., Janis, R.A, Falkenström, F., & Scofield, B.E. (in press). Therapeutic alliance and suicidal ideation during therapy and the moderating role of marginalized racial/ethnic identity, Psychotherapy Research

Kilcullen, J.R., Castonguay, L.G., Trusty, W.T. (in press). Therapist effects, case-mix factors, and treatment characteristics in university counseling centers. Journal of Counseling Psychology

Tan, H., Matsick, J.L., Castonguay, L.G., Janis, R.A., White, T.D., Magruder, S.A.N., Chun-Kennedy, C.L., & Brett E. Scofield, B.E. (in press). Previous Experiences of Discrimination Impact College Students’ Mental Health and Treatment Outcomes at University Counseling Centers. Journal of Counseling Psychology

Barkham, M., Boswell, J.F., Atzil-Slonim, D., Castonguay, L.G., & Lutz, W. (2026). Developing strategic recommendations for prioritizing local and national policies to promote practice-based evidence.  In L.G. Castonguay, D. Atzil-Slonim, M. Barkham, & W. Lutz. (Eds.). Practice-based evidence in the psychological therapies: Toward policy implications for research, training, and clinical Guidelines. New York: Oxford University Press.

Castonguay, L.G. (2026). Practice-research networks: collaborative partnerships for the integration of science, clinical work, and training. In L.G. Castonguay, D. Atzil-Slonim, M. Barkham, & W. Lutz. (Eds.). Practice-based evidence in the psychological therapies: Toward policy implications for research, training, and clinical Guidelines. New York: Oxford University Press.

Castonguay, L.G., Atzil-Slonim, D., Barkham, M., & Lutz, W. (2026). Practice-based evidence and practice-oriented research: setting the stage for the expansion of the scientific foundations of psychological therapies. In L.G. Castonguay, D. Atzil-Slonim, M. Barkham, & W. Lutz. (Eds.). Practice-based evidence in the psychological therapies: Toward policy implications for research, training, and clinical Guidelines. New York: Oxford University Press.

Hayes, J.A., & Castonguay, L.C. (2026). The seamless integration of science and practice in college student mental health: Building relationships among stakeholders to better understand and improve services. In L.G. Castonguay, D. Atzil-Slonim, M. Barkham, & W. Lutz. (Eds.). Practice-based evidence in the psychological therapies: Toward policy implications for research, training, and clinical Guidelines. New York: Oxford University Press.

Kumar, M., Paz, C., Falkeström, F., & Castonguay, L.G. (2025). Strengthening mental health systems in low- and middle-income countries (LMICs) by unleashing the potential of routine outcome monitoring. JAMA Psychiatry, 82, 953-954.

Rosendahl, J., Klatte, R., Frenzi, D., Castonguay, L.G., Vybíra, Z., & Strauss (2025). Contextualizing the negative effects of psychotherapy. Nature Reviews Psychology https://doi.org/10.1038/s44159-025-00472-8

Solomonov, N., Chen, S.Z., Briskin, E.A., Castonguay, L.G., Krause, M., McMain, S., Duggal, C., Youn, S.J., Lorenzo-Luaces, L., & Baber, J.P.  (2025). A First look at diversity gaps in psychotherapy research publications and representation. Psychotherapy Research, 35, 1275-1286.

Trusty, W.T., Castonguay, L.C., Chun-Kennedy, C.L., Magruder, S.A.N., Janis, R.A., Davis, K.A., Augustin, D.C., Scofield, B.E. (2025). Client characteristics and early working alliance development:  A person-centered research approach. Psychotherapy Research, 35,1229-1243.

Castonguay, L.G., Atzil-Slonim, D., de Jong, K., & Youn, S.J (2024) Practice-Oriented Research: An Introduction to New Developments and Future Directions. Administration and Policy in Mental Health and Mental Health Services Research, 51, 287-290.

Castonguay, L.G., Youn, S.J., Boswell, J.F., Kilcullen, J.R., Xiao, H., McAleavey, A.A., Boutselis, M., Braver, M., Chiswick, N., Hemmelstein, N., Jackson, J., Lytle, R., Morford, M., Scott, H., Spayd, C., & O’Leary Wiley (2024).  Therapeutic techniques and session impact: A practice-research network study in private practice. Psychotherapy Research, 34, 845-857.

Davis, K.A., Zhao, F., Janis, R.A., Castonguay, L.G., Hayes, J. A., & Scofield, B. E. (2024).  Therapeutic alliance and clinical outcome in in-person psychotherapy and teletherapy: A noninferiority study. Psychotherapy Research, 34, 589-600.

Fernández-Álvarez, J., Molinari, G., Kilcullen, J.R., Delgadillo, J., Drill, R., Errázuriz, P., Falkenström, F., Firth, N.,O’Shea, A., Youn, S.J., & Castonguay, L.G. (2024). The importance of conducting practice-oriented research with underserved populations. Administration and Policy in Mental Health and Mental Health Services Research, 51, 358-375.

Jacobsen, C. F., Falkenström, F., Castonguay, L.G., Nielsen, J., Lunn, S., Lauritzen, L.R., & Poulsen, S. (2024). The Relationship between Attachment Needs, Earned Secure Therapeutic Attachment and Outcome in Adult Psychotherapy. Journal of Consulting and Clinical Psychology, 92, 410-421.

Låver, J., McAleavey, A., Valaker, I., Castonguay, L.G., & Moltu, C. (2024). Therapists’ and patients’ experiences of using patients’ self-reported data in ongoing psychotherapy processes – a systematic review and meta-analysis of qualitative studies. Psychotherapy Research, 34, 293-310.

Castonguay, L.G., Boswell, J.F., Caspar, F., Friedlander, M.L., Gómez, B., Hayes, A.M., Grosse Holtforth, M., Messer, S.B., Newman, M.G., & Strauss, B.M. (2023). What competencies should therapists acquired and how should they acquire them? In L.G. Castonguay & C.E. Hill (Eds.). Becoming better therapists: Advancing training and supervision in psychotherapy. Washington, D.C.: American Psychological Association Press.

Constantino, M.J., Castonguay, L.G., Coyne, A.E., Boswell, J.F., & Newman, M.G. (2023).  Baseline Overly Accommodating Interpersonal Problems in Relation to Parsed Alliance-Outcome Associations in Cognitive Behavioral Therapy for Generalized Anxiety Disorder. Psychotherapy Research, 33, 3-15.

Kilcullen, J.R., Castonguay, L.G., Carney, D.M., Davis, K.A., Pottschmidt, Knapp, S.J., Jackson, C.L., Hemmelstein, N.A., & Frakes, A.M. (2023). Peer consultation for early career psychotherapists. In L.G. Castonguay & C.E. Hill (Eds.). Becoming better therapists: Advancing training and supervision in psychotherapy. Washington, D.C.: American Psychological Association Press.

Xiao, H., Castonguay, L.G., Hayes, J.A., Janis, R. A., & Locke, B.D. (2023). Reconstructing Dropout: Building From Multiple Definitions, Therapist Effects, and Center Effects. Psychotherapy Research, 33, 146-157.

Pottschmidt, N. R., Castonguay, L. G., Janis, R. A., Carney, D.M., Kilcullen, J. R., Davis, K. A., & Scofield, B. E. (2022) Client-therapist convergence on sleep difficulty and its impact on treatment outcomes. Psychotherapy Research, 32, 663-677.

Castonguay, L.G., Barkham, M., Youn, S.J., & Page, A.C. (2021).  Practice-based evidence: Findings from routine clinical settings. In M. Barkham, W. Lutz, & L.C., Castonguay (Eds.).  Bergin and Garfield’s handbook of psychotherapy and behavior change (7^th edition).  New York: Wiley.

Castonguay, L.G., Eubanks, C.F., Iwakabe, S., Kraus, M., Page, A.C., Zilcha-Mano, S., Lutz, W., & Barkham, M. (2021).  Epilogue: Prevalent themes, predictions, and recommendations. In M. Barkham, W. Lutz, & L.C., Castonguay (Eds.).  Bergin and Garfield’s handbook of psychotherapy and behavior change (7^th edition).  New York: Wiley.

Kilcullen, J.R., Castonguay, L.G., Janis, R.A., Hallquist, M.N., Hayes, J.A., & Loke, B. D. (2021). Predicting future courses of psychotherapy within a grouped LASSO framework. Psychotherapy Research, 31, 63-77.

McAleavey, A.A, Castonguay, L.G., Hayes, J.A., Locke, B.D. (2020). Multilevel vs single level factor analysis. Differentiating within-person and between-person variability using the CCAPS-34. Journal of Consulting and Clinical Psychology, 88, 907-922.

McAleavey, A.A., Youn, S.J., Xiao, H., Castonguay, L.G., Hayes, J.A., & Locke, B.D. (2019).  Effectiveness of routine psychotherapy: Methods matter. Psychotherapy Research, 29, 139-156.

Youn, S.J., Xiao, H., McAleavey, A., Scofield, B.E., Pedersen, T.R., Castonguay, L.G., Hayes, J.A., & Locke, B.D. (2019).  Assessing and investigating clinicians’ research interests: Lessons on expanding practices and data collection in a large practice research network.  Psychotherapy,56, 67-82.

Xiao, H., Castonguay, L.G., Janis, R.B, Youn, S.J., Hayes, J.A., & Locke, B.D. (2017).  Therapist Effects on Dropout from a College Counseling Center Practice Research Network. Journal of Counseling Psychology, 64, 424-431.

Xiao, H., Hayes, J.A., Castonguay, L.G., McAleavey, A.A., & Locke, B.D. (2017).  Therapist effects and the impacts of therapy non-attendance. Psychotherapy, 54, 58-65.

Hayes, J.A., McAleavey, A.A., Castonguay, L.G., & Locke, B.D. (2016). Psychotherapist effects with White and racial/ethnic minority clients: First, the good news.  Journal of Counseling Psychology, 63, 261-268.

Nordberg, S.S., Castonguay, L.G., McAleavey, A.A., Locke, B.D., & Hayes, J.A. (2016).  Enhancing feedback for clinical use: Creating and evaluating profiles of clients

seeking counseling. Journal of Counseling Psychology, 63, 278-293.

Castonguay, L.G., Eubanks, C., Goldfried, M.R., Muran, J.C., & Lutz, W. (2015).  Research in psychotherapy integration: Relevance of the past and necessity for the future. Psychotherapy Research, 25, 365-382.

Castonguay, L.G., & Muran, J.C. (2015).  Fostering collaboration between researchers and clinicians through building practice-oriented research: An introduction. Psychotherapy Research, 25, 1-5.

Castonguay, L.G., Pincus, A.L., & McAleavey, A.A. (2015). Practice-Research Network in a psychology training clinic: Building an infrastructure to foster early attachment to the scientific-practitioner model. Psychotherapy Research, 25, 52-66.

Castonguay, L.G., Youn, S.J., Xiao, H., Muran, J.C., & Barber, J.P. (2015).  Building clinicians-researchers partnerships: Lessons from diverse natural settings and practice-oriented initiatives. Psychotherapy Research, 25, 166-184.

Koerner, K., & Castonguay, L.G. (2015). Practice-oriented research: What it takes to do collaborative research in private practice.  Psychotherapy Research, 25, 67-83.

McAleavey, A.A., Lockard, A.J., Castonguay, L.G., Hayes, J.A., & Locke, B.D. (2015).  Building a practice research network: Obstacles faced and lessons learned at the center for collegiate mental health.  Psychotherapy Research, 25,134-151.

Zack, S.E., Castonguay, L.G., Boswell, J.F., McAleavey, A.A., Adelman, R., Kraus, D., & Pate, G.A. (2015).  Attachment history as a moderator of the alliance outcome relationship in adolescents. Psychotherapy, 52, 258-267

McAleavey, A.A., & Castonguay, L.G. (2014). Insight as a common and specific impact of psychotherapy: Therapist-reported exploratory, directive, and common factors interventions.  Psychotherapy, 51, 283-294.

McAleavey, A.A., Castonguay, L.G., & Xiao, H. (2014).  Therapist orientation, supervision match, and therapeutic interventions: Implication for session quality in a psychotherapy training practice research network. Counseling and Psychotherapy Research, 14, 192-200.

Nordberg, S.S., Castonguay, L.G., Fisher, A.J., Boswell, J.F., & Kraus, D. (2014). Validating the rapid responder construct within a practice research network. Journal of Clinical Psychology, 70, 886-903.

Castonguay, L.G., Locke, B.D., & Hayes, J.A. (2011). The Center for Collegiate Mental Health: An Example of a Practice-Research Network in University Counseling Centers, Journal of College Student Psychotherapy, 25, 105-119.

Boswell, J.F., Castonguay, L.G., & Wasserman, R. H.  (2010). Effects of Psychotherapy Training and Intervention Use on Session Outcome. Journal of Consulting and Clinical Psychology, 78, 717-723.

Castonguay, L.G., Boswell, J.F., Constantino, M.J., Goldfried, M.R., & Hill, C.E. (2010). Training Implications of Harmful Effects of Psychological Treatments. American Psychologist, 65, 34-49.

Castonguay, L.G., Boswell, J.F., Zack, S., Baker, S., Boutselis, M., Chiswick, N., Damer, D., Hemmelstein, N., Jackson, J., Morford, M.,  Ragusea, S.,  Roper, G., Spayd, C., Weiszer, T., Borkovec, T.D., & Grosse Holtforth,, M. (2010). Helpful and hindering events in psychotherapy: A practice research network study. Psychotherapy: Theory, Research, Practice, and Training, 47, 327-344.

Castonguay, L., Nelson, D., Boutselis, M.,  Chiswick, N., Damer, D., Hemmelstein,  N.,  Jackson, J., Morford, M., Ragusea, R.,  Roper, G.,  Spayd, C.,  Weiszer, T., & Borkovec, T. (2010). Clinicians and/or Researchers?  A Qualitative Analysis of Therapists’ Experiences in a Practice Research Network. Psychotherapy: Theory, Research, Practice, and Training, 47, 345-354.