Grant A Ritter

Associate Professor

Grant A Ritter's photo


Office: Heller-Brown Building 268
Phone: 781-736-3872
Brandeis Directory


statistics, quantitative methods, health services research


  • HS 410a - Applied Research Seminar: Quantitative


  • Cornell University
  • Medical College of Virginia
  • University of California, Berkeley
  • Swarthmore College

Grant A Ritter

Associate Professor


Grant A. Ritter PhD has expertise in the areas of sample design, data collection, and statistical analyses, particularly in area of health services research.


  • Gray, JC, Larson MJ, Moresco, N, Ritter, G, Dufour, S, Milliken, C, Adams, RS. "Association of Engagement in Substance Use Treatment with Negative Separation from the Military among Soldiers with Post-Deployment Alcohol Use Disorder." Drug and Alcohol Dependence 221. 8 (2021).
  • Mitra, M, McKee, M, Akobirshoev, I, Ritter, G, Valentine, A. "Pregnancy and Neonatal Outcomes Among Deaf and Hard of Hearing Women: Results from Nationally Representative Data." Women's Health Issues (2021).
  • Reif,S, Stewart, M, Torres, M, Davis, M, Dana, B, Ritter, G. "Effectiveness of Value-based Purchasing for Substance Use Treatment Engagement and Retention." Journal of Substance Abuse Treatment 122. 1 (2021).
  • Shields, M, Horgan, C, Ritter, G, Busch, A. "Use of Electronic Health Information Technology in a National Sample of Hospitals that Provide Specialty Substance Use Care." Psychiatric Services (2021).
  • Lee, M, Torres, M, Brolin, M, Merrick, E, Ritter, G, Panas, L, Horgan, C, Lane, N, Hopwood, J, De Marco, N, Gewirtz, A. "Impact of Support Navigators on Continuity of Care after Detoxification." Journal of Substance Abuse Treatment 112. (2020): 10-16.
  • Ma, S, Shepard, D, Ritter, G, Martell, R, Thomas, C. "The Impact of the Introduction of Generic Aromatose Inhibitors on Adherence to Hormonal Therapy over the Full Course of 5-year Treatment for Breast Cancer." Cancer 126. 15 (2020).
  • Mitra, M, McKee, M, Akobirshoev, I, Valentine, A, Ritter, G, Zhang, J, McKee, K, Iezzoni, L. "Pregnancy, Birth, and Infant Outcomes Among Women Who Are Deaf or Hard of Hearing." American Journal of Preventie Medicine 58. 3 (2020): 418-426.
  • Shields, M, Ritter, G, Busch, A. "Electronic Health Information Exchange at Discharge from Inpatient Psychiatric Care in Acute Care Hospitals." Health Affairs 39. 6 (2020): 958-967.
  • Torres, M, Brolin, M, Panas, L, Ritter, G, Hodgkin, D, Lee, M, Merrick, E, Horgan, C, Hopwood, J, Gewirtz, A, De Marco, N, Lane, N. "Evaluating the Feasibility and Impact of Case Rate Payment for Recovery Support Navigator Services: A Mixed Methods Study." BMC Health Services Research 20. 1004 (2020).
  • Acevedo, A, Miles, J, Panas, L, Ritter, G, Campbell, K, Garnick, D. "Disparities in Criminal Justice Outcomes after Beginning Treatment for SUDs: The Influence of Race/Ethnicity and Place." Journal of Studies on Alcohol and Drugs 80. 2 (2019).
  • Adams, R, Thomas, C, Ritter, G, Lee, S, Saadoun, M, Williams, t, Larson, M. "Predictors of Postdeployment Prescription Opioid Receipt and Long-tem Prescription Opioid Utilization Among Active Duty Soldiers." Military Medicine 184. 1-2 (2019): e101-e109.
  • Garnick, D, Horgan, C, Acevedo, A, Lee, M, Panas, L, Ritter, G, Campbell, K. "Rural Clients' Continuity into Follow-up Substance Use Disorder Treatment: Impacts of Travel Time, Incentives and Alerts." Journal of Rural Health 36. 2 (2019): 196-207.
  • Hodgkin, D, Brolin, M, Ritter, G, Torres, M, Merrick, E, Horgan, C, Hopwood, J, DeMarco, N, Gewirtz, A. "Cost Savings from a Navigator Intervention for Repeat Detoxification Clients." Journal of Mental Health Policy and Economics 22. 1 (2019).
  • Londhe, S, Ritter, G, Schlesinger, M.. "Medicaid Expansion in Social Context: Examining Relationships Between Medicaid Enrollment and County Level Food Insecurity." Journal of the Poor and Underserved 30. 2 (2019): 532-546.
  • Meerwijk, E, Larson, MJ, Schmidt, E, Adams, R, Bauer, M, Ritter, G, Buckenmaier, C, Harris, A. "Nonpharmacological Treatment of Army Service Members with Chronic Pain is Associated with Fewer Adverse Outcomes after Transition to the Veterans Health Administration." Journal of General Internal Medicine 35. 3 (2019): 775-783.
  • Miles, J, Acevedo, A, Panas, L, Ritter, G, Campbell, K, Delk, M. "Race/Ethnicity, Community of Residence, and DUI Arrest After Beginning Treatment for an Alcohol Use Disorder." Journal of Behavioral Health Services & Research (2019).
  • Reif, S, Adams, R, Ritter, G, Larson, MJ. "Exploration of the Association of Selected Pain Diagnoses with Risky Alcohol Use among Active Duty Soldiers." Substance Abuse (2019).
  • Acevedo, A, Lee, M, Garnick, D, Horgan, C, Ritter, G, Panas, L, Campbell, K, Bean-Mortinson, J. "Agency-level Financial Incentives and Electronic Reminders to improve Continuity of Care after Discharge from Residential Treatment and Detoxification." Journal of Drug and Alcohol Dependence 183. (2018).
  • Acevedo, A, Miles, J, Garnick, D, Panas, L, Ritter, G, Campbell, K, Acevedo-Garcia, D. "Employment after Beginning Treatment for Substance Use Disorders: The Impact of Race/Ethnicity and Client Communtiy of Residence." Journal of Substance Abuse Treatment 87. (2018).
  • Acevedo,A, Panas,L, Garnick, D, Miles, J, Ritter, G, Campbell, K, Acevedo-Garcia, D. "Disparities in the Treatment of Substance Use Disorders: Does Where you live Matter?." Journal of Behavioral Health Services and Research (2018).
  • Hefele J., Santos P., Ritter G., Varma, N., Hendricks A.. "Risk Factors for Shoulder Dystocia: the Impact of Mother's Race and Ethnicity." Journal of Racial and Ethnic Health Disparities 5. 2 (2018): 333-341.
  • Hoang, P, Hodgkin, D, Thomas, C, Ritter, G, Chillingerian, J. "Effect of Periodic Health Exam on Provider Management of Preventive Services." Journal of Evaluation in Clinical Practice (2018):
  • Larson, MJ, Adams, R, Ritter, G, Linton, A, Saadoun, M, Bauer, M. "Associations of Early Treatments for Low Back Pain with Military Readiness Outcomes." Journal of Alternative and Complementary Medicince 24. 7 (2018):
  • Lee, M, Acevedo, A, Garnick, D, Horgan, C, Panas, L, Ritter, G, Campbell, K. "Impact of Agency Receipt of Incentives and Reminders on Engagement and Continuity of Care for clients with Co-occurring Conditions." Psychiatric Services 69. 7 (2018):
  • Reif, S, Adams, R, Ritter, G, Larson, MJ. "Prevalence of Pain Diagnosis and Burden of Pain among Active Duty Soldiers." Military Medicine 183. 2 (2018): e330-3337.
  • Routhier, G, Meschede, T, Ritter, G, Molinsky, J, Rosenfeld, L. "Beyond Worst Case Needs: Measuring the Severity of Housing Insecurity Among Urban Renters." Housing Policy Debate 29. 2 (2018).
  • Stewart, M, Reif, S, Dana, B, Nguyen, A, Torres, M, Davis, M, Ritter, G, Hodgkin, D, Horgan, C. "Incentives in a Public Addition Treatment System: Effects on Waiting Time and Selection." Journal of Substance Abuse Treatment 95. (2018):
  • Thomas, C, Ritter, G, Harris, A, Garnick, D, Freedman, K, Herbert, B. "Applying ASAM Performance measure in Commercial Health Insurance and Services Data." Journal of Addition Medicine 12. 4 (2018):
  • Warfield, M, Adams, R, Ritter, G, Valentine, A, Williams, T, Larson, M,. "Health Care Utilization Among Children with Chronic Conditions in Military Families." Disability and Health Journal 11. 4 (2018):
  • Brice, Y., Joynt, K., Tompkins, C., Ritter, Grant A. "Meaningful Use and Hospital Performance on Post-Acute Utilization Indicators." Heatlh Services Research 53. 2 (2017): 803-823.
  • Garnick, D, Horgan, C, Acevedo, A, Lee, M, Panas, L, Ritter, G, Campbell, K, Bean-Mortinson, J. "Influencing Quality of Outpatient SUD Care: Implementation of Alerts and Incentives in Washington State." Journal of Substance Abuse 82. (2017).
  • Hefele, J, Ritter, Grant A, Bishop, C, Acevedo, A, Ramos, C, Nsiah-Jefferson, L, Katz, G,. "Examining Racial and Ethnic Differences in Nursing Home Quality." Joint Commission Journal on Quality and Safety 43. 11 (2017).
  • Santos, P, Hefele, J, Ritter, G A, Darden, J, Firnano, C, Henrich, A. "Population-based Risk Factors for Shoulder Dystocia." Journal of Obstetrics, Gynocologic, and Neonatal Nursing 47. (2017).
  • Reif S., Adams R., Ritter G., Williams T., Larson M.. "One-year Prevalence of Pain Diagnoses, Severity, Chronicity, nad Disposition in an Active Duty Army Sample." Journal of Pain 17. 4 (2016): S10.
  • Stason, W.,Ritter, Grant A, Martin T., Prottas, J., Tompkins, C., Shepard, D.. "Effects of Expanded Coverage for Chiropractic Services on Medical Costs in a CMS Demonstration." PloS ONE 11(2). doi 10.1371/journal.pone.0147959 (2016).
  • Walter, A., Lundgren, L., Ritter, G., Umez-Eronini, A.. "Alcohol Use and HIV Testing in a National Sample of Women." AIDS and Behavior 20(1). DOI 10.1007/s10461-015-1144-5 (2016): 84-96.
  • Acevedo, A., Garnick, D., Ritter, G., Lundgren, L., Horgan, C.. "Admission to Detoxification after Treament: Does Engagement Make a Difference?." Substance Abuse Aug 2015. (2015).
  • Acevedo, A., Garnick, D.W., Dunigan, R., Horgan, C.M., Ritter, G., Lee, M.T., Panas, L., Campbell, K., Haberlin, K., Huber, A., Lambert-Wacey, D., Leeper, T., and Reynolds, M.,. "Performance Measures and Racial/Ethnic Disparities in the Treatment of Substance Abuse,." Treatment of Journal of Studies on Alcohol and Drugs 76. 1 (2015): 57-67.
  • Merrick, EL, Hodgkin D, Horgan C, Panas L, Ritter G, Kasuba, P, Poskaner D, Nebussy RA. "Testing Novel Patient Financial Incentives to Increase Breast Cancer Screening." American Journal of Managed Care Dec 2015. (2015).
  • Rachel Sayko Adams, Mary Jo Larson, John D. Corrigan, Grant A. Ritter, Constance M. Horgan, Robert M. Bray, Thomas V. Williams. "Combat-acquired traumatic brain injury, posttraumatic stress disorder, and their relative associations with postdeployment binge drinking." Journal of Head Trauma Rehabilitation DOI 10.1097.HTR.82. (2015).
  • Reif, S., Stewart, M., Horgan, C., Mohr, B., Torres, M., Davis, M., Hodgkin, D., Ritter, G., Nguyen, A.. "Incentives in Public Addiction Treatment Systems: Context and Effects on Access, Retention, Selecion, and Outcomes." Alcoholism, Clinical and Experimental Research (2015).
  • Santos, P., Ritter, G., Hefele, J., Henrich, A. McCoy, CK. ". Decreasing Intrapartum Malpractice: Targeting the most Injurious Neonatal Adverse Events,." Journal of Healthcare Risk Management, 34. 4 DOI 10.1002.JHRM.1168 (2015): 20-27.
  • Zhu, J., Weingart, S., Ritter, G., Tompkins, C., Garnick, D. "Racial/Ethnic Disparities in Patient Experience with Communication in Hospitals: Real Differences or Measurement Errors." Medical Care 53. 5 DOI 10.1097.MLR.350 (2015): 446-454.
  • Deborah W Garnick, Constance M Horgan, Andrea Acevedo, Margaret T Lee, Lee Panas, Grant A Ritter, Robert Dunigan, Alfred Bidorini, Kevin Campbell, Karin Haberlin, Alice Huber, Dawn Lambert-Wacey, Tracy Leeper, Mark Reynolds, David Wright:. "Criminal justice outcomes after engagement in outpatient substance abuse treatment.." Journal of Substance Abuse Treatment 46. 3 (2014): 295-305.
  • Dunigan, R, Avecedo A, Campbell K, Garnick D, Horgan CM, Huber A, Lee M, Panas L, Ritter GA. "Engagement in Outpatient Substance Abuse Treatment and Employment Outcomes." Journal of Behavioral Health Services and Research 41. 1 DOI 10.1007/s11414 (2014): 20-36.
  • Lee, M.T., Horgan, C.M., Garnick, D.W., Acevedo, A., Panas, L., Ritter, G., Dunigan, R., Babakhanlou-Chase, H., Bidorini, A., Campbell, K., Haberlin, K., Huber, A., Lambert-Wacey, D., Leeper, T., and Reynolds, M.. "A Performance Measure for Continuity of Care after Detoxification: Relationship with Outcomes." Journal of Substance Abuse Treatment 47. 2 (2014): 130-139.
  • Razavi, M., Fournier, S., Ritter, G., Shepard, D., Strickler, G., Stason, W.. "Effects of Lifestyle Modification Programs on Cardiac Risk Factors." PLoS ONE 9. 12 DOI 10.1371journal.pone.0114772 (2014): online journal.
  • Shaharz, S., Lagu, T., Ritter G., Liu, X., Tompkins, C.. "Use of Systematic Methods to Improve Disease Identification in Administrative Data: The Case of Severe Sepsis Medical Care." Medical Care 10.1097.MLR.156 (2014).
  • Adams R, Larson MJ, Corrigan JD, Ritter GA, Williams TV. "Traumatic Brain Injury among United States Active Duty Military Personnel and Negative Drinking-Related Consequences." Journal of Substance Use and Misuse 48. 10 (2013): 821-36.
  • Herbert Fillmore, C Annette Dubard, Grant A Ritter, Carlos T Jackson. "Health Care Savings with the Patient-Centered Medical Home: Community Care of North Carolina's Experience.." Population Health Management. 20. 10 (2013).
  • Mary Jo Larson, Grant A Ritter, Rachel Sayko Adams. "Letter to the Editor: Suicides Among Military Personnel.." JAMA The Journal of the American Medical Association 310. 23 (2013): 2565.
  • Ryan M, Merrick EL, Hodgkin D, Horgan CM, Garnick D, Panas L, Ritter GA, Blow FC, Satz R. "Drinking Patterns in Older Adults with Chronic Medical Conditions." Journal of General Internal Medicine 28. 10 (2013): 1326-1332.
  • Stewart M, Garnick D, Horgan C, Ritter GA, McClellan T. "Performance Contractingand Quality Improvement in Outpatient Treatment: Effects of Waiting Time and Length of Stay." Journal of Substance Abuse Treatment 44. 1 (2013): 27-33.
  • Wittenberg E, Ritter GA, Prosser LA. "Evidence of Spillover of Illness among Households Members: EQ-5D Scores from a US Sample." Medical Decision Making 33. 2 (2013): 235-243.
  • Wu Zeng, William B Stason, Stephen Fournier, Moaven Razavi, Grant Ritter, Gail K Strickler, Sarita M Bhalotra, Donald S Shepard. "Benefits and costs of intensive lifestyle modification programs for symptomatic coronary disease in Medicare beneficiaries.." American heart journal 165(5):785-92. 165. 5 (2013): 785-92.
  • Acevedo, A, Garnick, D, Lee, M, Horgan, C., Ritter, G, Panas, L., Davis, S, Leeper, T, Moore, R, Reynolds, M.. "Racial/Ethnic Differences in Substance Abuse Treatment Initiation and Engagement." Journal of Ethnicity in Substance Abuse 11. (2012): 1-21.
  • Granick D, Lee M, O'brien M, Panas L, Ritter, GA, Acevedo A, Garner B, Funk R, Godley M. "The Washington Circle Engagement Performance Measures' Association with Adolescent Treatment Outcomes." Journal of Drug and Alcohol Dependence 124. 3 (2012): 250-258.
  • Larson MJ, Mohr B, Adams R, Perloff J, Williams T, Ritter GA, Tompkins C. "Association of Military Deployment of a Parent or Spouse and Changes in Dependent Use of Health Care Services." Medical Care 50. 9 (2012): 821-828.
  • Lee M, Garnick D, O'Brien P, Panas L, Ritter G, Avecedo A, Garner B, Funk R, Godley M. "Adolescent Treatment Initiation and Engagement in an Evidence-Based Practice Initiative." Journal of Substance Abuse Treatment 42. 4 (2012): 346-355.
  • Merrick EL, Reif S, Hiatt D, Hodgkin D, Horgan CM, Ritter G,. "Substance Abuse Treatment Client Experience in an Employed Population: Results of a Client Survey." Journal of Substance Abuse Treatment, Prevention, and Policy 7. 4 (2012).
  • Merrick, EL, Hodgkin, D, Panas L, Soumerai SB, Ritter, GA. "Is customization in antidepressant prescribing associated with acute-phase treatment adherence?." Journal of Pharmaceutical Health Services Research 3. 1 (2012): 11-16.
  • Reif, S., Ritter, G, Horgan, CM. "Treatment Services: Triangulation of Methods When There Is No Gold Standard." Substance Use and Misuse 46. 5 (2011): 620-632.
  • Merrick EL, Hodgkin D, Hiatt D, Horgan CM, Azzone V, McCann B, Ritter, Grant A. "Patterns of service use in two types of managed behavioral health care plans." Psychiatric Services 61. 1 (2010): 86-89.
  • Merrick EL, Hodgkin D, Horgan CM, Hiatt D,Azzone V, McCann B, Zolotusky, Ritter G, A. "Integrated employee assistance program/ Managed behavior health care benefits: Relationship with access and client characteristics." Administration and Policy in Mental Health and Mental Health Services Research 36. 6 (2009): 416-423.
  • Tompkins, C., Higgins, A., Ritter, G.. "Measuring Outcomes and Efficiency in Medicare Value-Based Purchasing." Health Affairs 28. 2 (2009).
  • Hodgkin D., Thomas C., Simoni-Wastila L., Ritter G., Lee S.. "The Effect of a Three-Tier Formulary on Antidepressant Utilization and Expenditures,." Journal of Mental Health Policy and Economics 11. 2 (2008).
  • Reif, S., Horgan C., Ritter G.. "Hispanics in Specialty Treatment for Substance Abuse Disorders." Journal of Drug Issues 38. 1 (2008).
  • Thomas C., Reif S., Wallack S., Martin T., Hoyt A, Ritter G.. "Use of buprenorphine for addiction treatment: Perspectives of addiction specialists and other psychiatrists." Psychiatric Services 59. 8 (2008).
  • Thomas, C, Hodgkin D, Wallack S, Martin T, Ritter G, Mark T. "Mental Health and Substance Abuse Treatment Prescription Drugs: Lessons From a Period of High Spending Growth." Journal of Pharmaceutical Finance, Economics and Policy 16. 3 (2008).
  • Beaston-Blaakman, A., Shepard, D., Horgan, C., Ritter, G. "Organizational and Client Determinants of Cost in Outpatient Substance Abuse Treatment." Journal of Mental Health Policy and Economics 10. 1 (2007).
  • Garnick,D.W., Horgan,C.M, Lee,M.T., Panas,L., Ritter,G.A, Davis,S., Leeper,T., Moore,R., & Reynolds,M.. "Are Washington Circle Performance Measures Associated With Decreased Criminal Activity Following Treatment?." Journal of Substance Abuse Treatment 33. 4 (2007).
  • Pfefferle, S, Gittell, J, Hodgkin, D, Ritter, G.. "Pediatrician Coordination of Care for Children with Mental Illnesses." Medical Care 44. 12 (2006).
  • Krenske, T, Mohadjer, L., Ritter, G, Gadzuk, A.. "Incentive Effects on Self - Report on Drug Use and Other Measures or Response Quality of Alcohol and Drug Services Study -." Journal of Economic and Social Measurement (2005).
  • Ritter G, Reif S, Gadzuk A, Krenzke T, Mohadjer L, Lee M, Horgan C.. "Incentive Effects on Cooperation Rates and Sample Composition in the Alchol and Drug Services Study -." Journal of Economic and Social Measurement (2005).
  • Reif S, Horgan CM, Ritter G, Tompkins C. "The Impact of Employment Counseling on Substance User Treatment Participation and Outcomes." Substance Users and Misuse Vol. 39. (2004): 2391-2424.