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University of Colorado Denver College of Liberal Arts and Sciences

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Faculty & Staff Directory

Krista Ranby, Ph.D.

Assistant Professor

Email: Krista Ranby
Website: Healthy Couples Lab
Office Location: 5008D
Phone: (303) 556-3452
Fax: (303) 556-3520
Office hours: Mondays 1-3 and by appointment
Areas of Expertise:
Social Psychology, Models of Health Behavior, Quantitative Methods​​ ​​​​​

Education & Degrees

Postdoctoral Associate, Transdisciplinary Prevention Research Center, Duke University 2009-2012
Ph.D., Psychology, Arizona State University, 2009
M.A., Psychology, Arizona State University, 2006
B.A., Psychology, Southwestern University, 2003​


Dr. Ranby is an Assistant Professor in the Department of Psychology at the University of Colorado Denver. She comes to the study of health behavior from the perspective of social and quantitative psychology. She is particularly interested in the ways that close relationship partners affect each other's daily health behaviors. Her work has involved psychometrically distinguishing multiple types of social influence on behavior (i.e., exercise) and incorporating these influences into a maintenance model of behavior among older adult women. She has worked on a couples-based cessation intervention for couples who both smoke which involves framing risk messages in terms of outcomes for the couple and guides couples to develop plans for change together. Dr. Ranby has also worked with daily diary data from couples to examine influences between partners over time. Dr. Ranby is beginning work with engaged couples to understand how partners influence each other’s behaviors across life transitions.

Dr. Ranby’s work has crossed a range of health outcomes given her interest in quantitative methods, particularly mediation analysis of health promotion interventions. She has evaluated interventions developed for high school female athletes, fire fighters, HIV positive victims of childhood sexual abuse, and dual-smoker couples.

Dr. Ranby encourages undergraduate students at CU Denver and Clinical Health PhD applicants to contact her to learn about becoming involved in the lab.

Select Publications

Lipkus, I. M., Ranby, K. W., Lewis, M. A., & Toll, B. (in press). Reactions to framing of cessation messages: Insights from dual-smoker couples. Nicotine & Tobacco Research. Available online August 13, 2013. doi:10.1093/ntr/ntt091

Fuemmeler, B. F., Lee, C., Ranby, K. W., Clark, T., McClernon, F. J., Yang, C., & Kollins, S. H. (2013). Individual- and community-level correlates of cigarette-smoking trajectories from age 13 to 32 in a U.S. population-based sample. Drug and Alcohol Dependence, 132, 301-308. doi: 10.1016/j.drugalcdep.2013.02.021

Drabkin, A. S., Sikkema, K. J., Wilson, P. A., Meade, C. S., Hansen, N. B., DeLorenzo, A., Kochman, A., Watt, M. H., Aunon, F. M., MacFarlane, J. C., Ranby, K. W., & Mayer, G. (2013). Risk patterns preceding diagnosis among newly HIV-diagnosed men who have sex with men in New York City. AIDS patient Care & STDs, 27(6), 333-341.

Ranby, K. W., Lewis, M. A., Toll, B. A., Rohrbaugh, M. J., & Lipkus, I., M. (2013). Perceptions of smoking-related risk and worry among dual-smoker couples. Nicotine & Tobacco Research, 15, 734-738. doi: 10.1093/ntr/ntr210

Sikkema, K. J., Ranby, K. W., Meade, C., Hansen, N., Wilson, P. & Kochman, A. (2013). Reductions in traumatic stress following a coping intervention were mediated by decreases in avoidant coping for people living with HIV/AIDS and childhood sexual abuse. Journal of Consulting and Clinical Psychology, 81(2), 274-283. doi: 10.1037/a0030144

Meade, C. S., Watt, M. H., Sikkema, K. J., Deng, L. X., Ranby, K. W., Skinner, D., Pieterse, D., & Kalichman, S. C. (2012). Methamphetamine use is associated with childhood sexual abuse and HIV sexual risk behaviors among patrons of alcohol- serving venues in Cape Town, South Africa. Drug and Alcohol Dependence, 126, 232-239.

Watt, M. H., Ranby, K. W., Meade, C. S., Sikkema, K. J., MacPharlane, J. C., Skinner, D., Pieterse, D., & Kalichman, S. C. (2012). Posttraumatic stress disorder symptoms mediate the relationship between traumatic experiences and drinking behavior among women attending alcohol-serving venues in a South African township. Journal of Studies on Alcohol and Drugs, 73(4), 549-558.

Ranby, K. W., Boynton, M. H., Kollins, S. H., Yang, C., McClernon, F. J., & Fuemmeler, B. F. (2012). Understanding the phenotypic structure of adult retrospective ADHD symptoms during childhood in the United States. Journal of Clinical Child & Adolescent Psychology, 41(3), 261-274. doi:10.1080/15374416.2012.654465

Ranby, K. W., MacKinnon, D. P., Fairchild, A. J., Elliot, D. L., Kuehl, K. S. & Goldberg, L. (2011).The PHLAME (Promoting Healthy Lifestyles: Alternative Models’ Effects) firefighter study: Testing mediating mechanisms. Journal of Occupational Health Psychology, 16(4), 501-513. doi: 10.1037/a0023002

Sikkema, K. J., Watt, M. H., Meade, C. S., Ranby, K. W., Kalichman, S. C., Skinner, D. & Pieterse, D. (2011). Mental health and HIV sexual risk behavior among patrons of alcohol serving venues in Cape Town, South Africa. Journal of Acquired Immune Deficiency Syndromes, 57, 230-237.

MacKinnon, D. P., Elliot, D., Thoemmes, F., Kuehl, K. S., Moe, E. L., Goldberg, L., Burrell, G. L., & Ranby, K. W. (2010). Long-term effects of a worksite health promotion program for firefighters. American Journal of Health Behavior, 34, 695-706.

Ranby, K. W., Aiken, L. S., Gerend, M. A., & Erchull, M. J. (2010). Perceived susceptibility measures are not interchangeable: Absolute, direct comparative and indirect comparative risk. Health Psychology, 29(1), 20-28.

Ranby, K. W., Aiken, L. S., MacKinnon, D. P., Elliot, D. L., Moe, E. L., Goldberg, L., & McGinnis, W. (2009). A mediation analysis of the ATHENA intervention for female athletes: Prevention of athletic-enhancing substance use and unhealthy weight loss behaviors. Journal of Pediatric Psychology, 34(10), 1069-1083.


Courses Taught

​​Advanced Statistics (PSYC 7713)
Multivariate Statistics (PSYC 7710)
Advanced Social Psychology (PSYC 8550)
Statistics and Research Methods (PSYC 2090) ​​