John Vessey, Ph.D.


Psychology Undergraduate Programs

Associate Professor of Psychology
On Faculty since 2001

Office: BGC M252
Phone: (630)752-5761
Fax: (630)752-7033


Ph.D. Psychology, Northwestern University, 1991

M.S. Statistics, Northwestern University, 1990

B.A. Psychology, Wheaton College, 1986

About John Vessey

Dr. Vessey's interests include Methodology, Program Evaluation, Psychometrics, Statistics, Experimental Design, Sex Education, and  Classical Christian Education >>.

Courses Taught

Research Interests

Dr. Vessey serves as a technical advisor for several national evaluations of abstinence-only sex education programs. He is also interested in psychotherapy research and mental health outcomes research, as well as research on obesity, smoking cessastion, cardiovascular disease, and diabetes.


Articles and Papers

Finger, Thelen, Vessey, Mohn, Mann (2005). Association of Virginity at Age 18 With Educational, Economic, Social, and Health Outcomes in Middle Adulthood. Adolescent and Family Health 3 (4): 164-170.

Fabian, Toomey, Mitchell, Erickson, Vessey, Wagenaar (2005). Do organizations that voluntarily participate in a program differ from non-participating organizations? Evaluation and Program Planning 28 (2):161-165.

Hennrikus, Lando, McCarty, Klevan, Holtan, Huebsch, Jestus, Pentel, Pine, Sullivan, Swenson, Vessey (2005). The TEAM project: the effectiveness of smoking cessation intervention with hospital patients. Preventive Medicine 40:249-258.

Lando, Hennrikus, McCarty, Vessey (2003). Predictors of Quitting in Hospitalized Smokers. Nicotine & Tobacco Research 5 (2): 215-222.

Hennrikus, Jeffery, Lando, Murray, Brelje, Davidann, Baxter, Thai, Vessey, Liu (2002). The SUCCESS Project: The Effect of Program Format and Incentives on Participation and Cessation in Worksite Smoking Cessation Programs. American Journal of Public Health 92 (2): 274-279.

Lenk Toomey, Wagenaar, Bosma, Vessey (2002). Can neighborhood associations be allies in health policy efforts? Political activity among neighborhood associations. Journal of Community Psychology Vol 30 (1), 57-68.

Mann, Stine, Vessey (2002). The Role of Disease-Specific Infectivity and Number of Disease Exposures on the Long-Term Effectiveness of the Latex Condom. Sexually Transmitted Diseases. 29 (6): 344-349.

McCarty, Lando, Hennrikus, Vessey (2001). Nurses’ Attitudes Concerning the Delivery of Brief Cessation Advice to Hospitalized Smokers. Preventive Medicine 33: 674-681.

St. Peter, Neafus, Khan, Vessey (2001) Factors associated with the risk of liver enzyme elevation in patients with type 2 diabetes treated with a thiazolidinedione. Pharmacotherapy 21(2): 183-188.

Khan, St. Peter, Breen, Hartley, Vessey (2000). Diabetes Disease Stage Predicts Weight Loss Outcomes with Long-term Appetite Suppressants. Obesity Research 8 (1) 43-48.

Nicholson, Hennrikus, Lando, McCarty, Vessey (2000). Patient recall versus physician documentation in report of smoking cessation counseling performed in the inpatient setting. Tobacco Control 9: 382-388.

Lueger, Robert J; Saunders, Stephen M; Howard, Kenneth I; Vessey, John T; Nunez, Pierre R. Entering psychotherapy: Probabilities, routes, and finances. [Chapter] Miller, Nancy E. (Ed), Magruder, Kathryn M. (Ed), et al. (1999). Cost-effectiveness of psychotherapy: A guide for practitioners, researchers, and policymakers. (pp. 63-71). New York, NY, USA: Oxford University Press. xxx, 354 pp.

Tsai, Welge, Hanson, Bignell, Vessey, Schwichtenberg, Yang, Bullemer, Rasmussen, Graham (1999). Genetic Causes of Mild Hyperhomocysteinemia in Patients with Occlusive Coronary Artery Diseases. Atherosclerosis 143(1999) 163-170.

Khan, Herzog, St. Peter, Hartley, Madlon-Kay, Dick, Asinger, Vessey (1998). The Prevalence of Cardiac Valvular Insufficiency Assessed by Transthoracic Echocardiography in Obese Patients Treated with Appetite-Suppressant Drugs. New England Journal of Medicine 339: 713-718.

Lyons, Stutesman, Neme, Vessey, O’Mahoney, Camper (1997). Predicting Psychiatric Emergency Admissions and Hospital Outcomes. Medical Care 35 (8): 792-800. Lyons, Vessey, Kisiel, Rosenbloom (1997). Understanding Decision-Making: Optimal Data Analysis and Child Services. Family Matters Dec/Jan 12-13.

Howard, Cornille, Lyons, Vessey, Lueger, Saunders (1996). Patterns of Mental Health Service Utilization. Archives of General Psychiatry 53, August: 696-703.

Lyons, Shasha, Christopher, Vessey, O’Mahoney, Camper. Decision Support Technology in Managed Care [Chapter] in Stout, et. Al. (1996) The Integration of Psychological Principles in Policy Development (161-170) Praeger Publishers/Greenwood Publishing Group, Inc.

Krause, Howard, Vessey (1994). Analysis of Clinical Trial Data: the Problem of Outcome Overlap. Psychotherapy 31 (2): 302-307.

Vessey, Howard, Lueger, Kachele, Mergenthaler (1994). The Clinician's Illusion and the Psychotherapy Practice: An Application of Stochastic Modeling. Journal of Consulting and Clinical Psychology 62 (4): 679-685.

Vessey, Larson, Lyons, Rogers, Howard (1994). Condom Safety and HIV. Sexually transmitted Diseases, 21(1) 59-61.

Rogers, Howard, Vessey (1993). Using Significance Tests to Evaluate Equivalency Between Two Experimental Groups. Psychological Bulletin 113 (3): 553-565.

Vessey, Howard (1993). Who Seeks Psychotherapy? Psychotherapy 30 (4): 546-553.

Howard, Vessey, Lueger, Shank (1992). The Psychotherapeutic Service Delivery System. Psychotherapy Research 2 (3): 164-180.

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