Current Fellows



sarah Gutkind

Sarah Gutkind, MSPH is an SAETP pre-doctoral fellow in the MSPH Department of Epidemiology. Her research interests include harm reduction for people who use drugs and disparities in substance use treatment outcomes. In her previous research she conducted economic evaluations alongside clinical trials related to hepatitis C screening, linkage to care, and treatment interventions in people who inject drugs using micro-costing methods and decision analytic modeling. She was also involved in a costing analysis of overdose education and naloxone distribution in New York City. She completed her MSPH  in Health Education and Health Communications at Johns Hopkins School of Public Health in the Health, Behavior and Society Department in 2016.

Selected Publications

  • Gutkind, S., Schackman, B.R., Morgan, J.R., Leff, J.A., Agyemang, L., Murphy, S.M., Akiyama, M.J., Norton, B.L., Litwin, A.H. and Linas, B.P., 2019. Cost-effectiveness of HCV Treatment Models for People Who Inject Drugs in Opioid Agonist Treatment Programs. Clinical Infectious Diseases.
  • Behrends, C.N., Eggman, A.A., Gutkind, S., Bresnahan, M.P., Fluegge, K., Laraque, F., Litwin, A.H., Meissner, P., Shukla, S.J., Perumalswami, P.V. and Weiss, J., 2019. A Cost Reimbursement Model for Hepatitis C Treatment Care Coordination. Journal of Public Health Management and Practice, 25(3), pp.253-261.
  • Schackman, B.R., Gutkind, S., Morgan, J.R., Leff, J.A., Behrends, C.N., Delucchi, K.L., McKnight, C., Perlman, D.C., Masson, C.L. and Linas, B.P., 2018. Cost-effectiveness of hepatitis C screening and treatment linkage intervention in US methadone maintenance treatment programs. Drug and alcohol dependence, 185, pp.411-420.

Erik S. Jorgenson

Erik JorgensonErik S. Jorgenson, MPH, is a SAETP pre-doctoral fellow in the MSPH Department of Epidemiology. His research primarily focuses on the intersections of violence and health, and his current work involves investigating trends in adolescent opioid use to advance scientific understanding of the drugs-violence connection in American youth. A point of emphasis in his work is the use of “big data” in service of evidence-based policy and practice. His prior research leverages a range of national surveillance systems including vital statistics, crime reports, and survey data to answer fundamental questions about firearm use, injury offending and victimization, and youth and intimate partner homicide. His prior work includes countermeasures to reduce household injuries and minority health disparities in treatment access and utilization. Erik received a BS in Community Health from the University of Maryland, College Park, School of Public Health and a MPH from the University of Pennsylvania, Perelman School of Medicine.

Selected Publications

  • Jorgenson ES, Richardson DM, Thomasson AM, Nelson CL, Ibrahim SA. (2015). Race, rehabilitation, and 30-day Readmission after Elective Total Knee Arthroplasty. Geriatric Orthopedic Surgery and Rehabilitation, 6(4), 313-310.
  • Baker JF, Leonard MB, Long J, Mostoufi-Moab S, Denburg M, Jorgenson ES, Sharma P, Zemel B, Taratuta EG, Ibrahim SA. (in press). Muscle deficits in rheumatoid arthritis contribute to inferior cortical bone structure and trabecular bone mineral density. The Journal of Rheumatology.
  • Baker JF, Sauer BC, Cannon GW, Teng CC, Michaud K, Ibrahim SA, Jorgenson ES, Davis L, Caplan L, Mikuls TR. (2016). Changes in body mass related to the initiation of disease-modifying therapies in rheumatoid arthritis. Arthritis & Rheumatology, 68(8), 1818-27.

Shadiya L. Moss

Shadiya Moss

Shadiya L. Moss, MPH, is a SAETP pre-doctoral fellow and PhD candidate in the MSPH Department of Epidemiology, where she was formerly an IMSD fellow. She is a social epidemiologist, with a focus on substance abuse and psychiatric disorders. Her research focuses on the impact of mass incarceration on the Black family and community, with specific interest in parental criminal justice system involvement and offspring behavioral, psychiatric, and substance use outcomes. Shadiya is also interested in integrating epidemiologic methods with community-based participatory research. Prior to her doctoral training, Shadiya conducted community-based participatory research at the Children’s Hospital of Philadelphia, which focused on interventions to improve depression among pregnant women, mothers, and their children. She has also worked at the University of Pennsylvania and Temple University on various research projects, which included a mixed methods study of breast cancer survivorship, interventions to improve mental health outcomes among African American adults, and testing the feasibility of a web-based data collection system among homeless populations with psychiatric and/or substance use disorders. Shadiya received a BS in Psychology from Drexel University and an MPH from the University of Pennsylvania, Perelman School of Medicine.

Selected Publications

  • Dean LT, Moss SL*, Rollinson SI, Jaramillo LF, Paxton RJ, Owczarak JT. Patient recommendations for reducing long-lasting economic burden after breast cancer. Cancer. 2019 Jun 1;125(11):1929-40. (*Dean LT and Moss SL are co-first authors)
  • Dean LT, Moss SL, Ransome Y, Frasso-Jaramillo L, Zhang Y, Visvanathan K, Nicholas LH, Schmitz KH. “It Still Affects Our Economic Situation": A Mixed Methods Analysis of Long-Term Economic Burden due to Breast Cancer and Lymphedema among Breast Cancer Survivors in the United States. Supportive Care in Cancer. 2019 May 1;27(5):1697-708.
  • Moss SL, Santaella‐Tenorio J, Mauro PM, Keyes KM, Martins SS. Changes over time in marijuana use, deviant behavior and preference for risky behavior among US adolescents from 2002 to 2014: Testing the moderating effect of gender and age. Addiction. 2019 Apr;114(4):674-86.
  • Dean LT & Moss SL*, McCarthy AM, Armstrong KA. Healthcare system distrust, physician trust, and patient discordance with adjuvant breast cancer treatment recommendations. Cancer Epidemiol Biomarkers Prev.  2017;26(12):1745-1752. (*Dean LT and Moss SL are co-first authors)
  • Eyrich-Garg KM, Moss SL. How feasible is multiple time point web-based data collection with individuals experiencing street homelessness? Journal of Urban Health. 2017 Feb 1;94(1):64-74.

Alexander S. Perlmutter

Alexander PerlmutterAlexander S. Perlmutter, MPH, is a SAETP pre-doctoral fellow in the MSPH Department of Epidemiology. His research interests include methodological issues, causal inference, and policy effects in substance use epidemiology. He has worked with national data sets to assess the effects of prescription opioid misuse and medical marijuana laws on several important health outcomes. Alex has also authored multiple international reviews of substance use among adolescents. He completed his MPH in the MSPH Department of Epidemiology in 2016. Alex frequently works with in the Centre de Recherche d’Épidemiologie et Statistique Sorbonne Paris Cité, where he studied methodological problems in conducting health research. His projects there range from assessing primary outcome modifications in oncology clinical trials to evaluating patient perceptions of biometric monitoring devices used in clinical trials.

Selected Publications

  • Perlmutter, A. S., Tran, V. T., Dechartres, A., & Ravaud, P. (2017). Statistical controversies in clinical research: comparison of primary outcomes in protocols, public clinical-trial registries and publications: the example of oncology trials. Ann Oncol, 28(4), 688-695.
  • Perlmutter, A. S., Conner, S. C., Savone, M., Kim, J. H., Segura, L. E., & Martins, S. S. (2017). Is employment status in adults over 25 years old associated with nonmedical prescription opioid and stimulant use? Social Psychiatry and Psychiatric Epidemiology, 52(3), 291-298.
  • Martins, S. S., Segura, L. E., Santaella-Tenorio, J., Perlmutter, A., Fenton, M. C., Cerda, M., . . . Hasin, D. S. (2017). Prescription opioid use disorder and heroin use among 12-34 year-olds in the United States from 2002 to 2014. Addict Behav, 65, 236-241.
  • Perlmutter A.S., Segura L.S., Santaella-Tenorio J., Mauro P.M., Mauro C.M., Martins S.S.. (June 2017). Is the increased prevalence of arrest comparing marijuana users to non-users different by race/ethnicity over time? Submitted for publication. Poster presentation at the annual conference of the College on Problems of Drug Dependence, Montreal, Canada.




Elizabeth D. Nesoff

Elizabeth NesoffElizabeth D. Nesoff, PhD MPH, is a SAETP post-doctoral research fellow in the MSPH Department of Epidemiology. She is a social epidemiologist focused on the intersection of substance use, the neighborhood environment, injury prevention, and health disparities. Her current research uses spatial analysis methods to investigate the relationship between modifiable neighborhood features and opioid overdose risk. She holds a PhD from the Department of Health, Behavior and Society at the Johns Hopkins Bloomberg School of Public Health. Her dissertation research focused on the impact of the alcohol environment on pedestrian injury risk and was supported by a Ruth L. Kirschstein National Research Service Award from the National Institute on Alcohol Abuse and Alcoholism. Prior to completing her doctoral training, Dr. Nesoff worked at the Centers for Disease Control and Prevention as a research fellow with the Division for Heart Disease and Stroke Prevention and as a health communication fellow in the National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention. Dr. Nesoff earned an MPH from the Emory University Rollins School of Public Health, and a BA from Wellesley College.

Selected Publications

  • Nesoff ED, Branas CC, Martins SS. (2019). The geographic distribution of fentanyl-involved overdose deaths in Cook County, Illinois. American Journal of Public Health. doi: 10.2105/AJPH.2019.305368. In press
  • Nesoff ED, Milam AJ, Barajas CB, Furr-Holden CDM. (2019). Expanding Tools for Investigating Neighborhood Indicators of Drug Use and Violence: Validation of the NIfETy for Virtual Street Observation. Prevention Science. doi: 10.1007/s11121-019-01062-w. In press
  • Nesoff ED, Milam AJ, Pollack KM, Curriero FC, Bowie JV, Knowlton AR, Gielen AC, Furr-Holden CDM. (2019) Neighbourhood Alcohol Environment and Injury Risk: A Spatial Analysis of Pedestrian Injury in Baltimore City. Injury Prevention, 25(5): 350-356.
  • Nesoff ED, Milam AJ, Branas CC, Martins SS, Knowlton AR, Furr-Holden CDM. (2018). Alcohol Outlets, Neighborhood Retail Environments, and Pedestrian Injury Risk. Alcoholism: Clinical and Experimental Research, 42(10): 1979-1987.
  • Nesoff ED, Branas CC, Martins SS. (2018). Challenges in Studying Statewide Pedestrian Injuries and Drug Involvement. Injury Epidemiology, 5(1):43.

Hillary Samples

Hillary Samples, PhD MHS, is a SAETP post-doctoral research fellow in the MSPH Department of Epidemiology. She has worked with national data and large health care databases to identify risk factors for substance use problems, analyze patterns of prevention and treatment services, and evaluate the impact of policies by assessing trends in services and outcomes. Her current projects examine the clinical epidemiology of opioid-related problems and treatment, including studies of adverse opioid-related outcomes and patterns of medication treatment for opioid addiction among Medicaid enrollees. Dr. Samples earned her PhD in Health Services Research and Policy from the Department of Health Policy and Management and her MHS from the Department of Mental Health at the Johns Hopkins Bloomberg School of Public Health. Prior to completing her graduate training, she earned her BA in Psychology from the University of Virginia and worked as a clinical research coordinator and psychometrist at the University of Virginia Health System.

Selected Publications

  • Williams AR, Olfson M, Samples H, Crystal C. (In press). Acute care, prescription opioid use, and overdose following discontinuation of long-term buprenorphine treatment for opioid use disorder. American Journal of Psychiatry.
  • Samples H, Stuart EA, Olfson M. (2019). Opioid Use, Misuse, and Suicidal Behaviors in a Nationally Representative Sample of U.S. Adults. American Journal of Epidemiology, 188(7), 1245-1253.
  • Samples H, Williams AR, Olfson M, Crystal S. (2018). Risk Factors for Discontinuation of Buprenorphine Treatment for Opioid Use Disorders in a Multi-State Sample of Medicaid Enrollees. Journal of Substance Abuse Treatment, 95, 9-17.
  • Samples H, Bandara SN, Olfson M, Saloner B (2018). Tobacco Screening and Counseling for Smokers with Mental Health and Substance Use Problems in the United States. American Journal of Preventive Medicine, 55(4), 524-532.

Justin Knox

Justin Knox, PhD MPH MSc, is a SAETP post-doctoral research fellow in the MSPH Department of Epidemiology. He is an epidemiologist whose research focuses on substance use and infectious diseases. His current projects examine the health benefits of drinking reductions among the US general population, as well as intervention research aimed at HIV treatment and prevention adherence. Dr. Knox earned his PhD in Epidemiology from MSPH. His dissertation research was on substance use and HIV risk among social networks of black South African men who have sex with men, and was supported by a Ruth L. Kirschstein National Research Service Award from the National Institute on Drug Abuse and the U.S. Fulbright Student Program. Dr. Knox has an MPH from MPSH, an MSc in Medical Anthropology from University College London and a BA from Middlebury College. He also served as a Peace Corps volunteer in Swaziland.

Selected Publications

  • Knox J, Wall M, Witkiewitz K, Kranzler HR, Falk D, Litten R, Mann R, O’Malley SS, Scodes J, Anton R, Hasin DS. Reduction in non-abstinent WHO drinking risk levels and change in risk for liver disease and positive AUDIT-C scores: prospective 3-year follow-up results in the US general population (2018). Alcoholism: Clinical & Experimental Research, 42(11):2256-2265.
  • Knox J, Reddy V, Lane T, Lovasi G, Hasin D, Sandfort T. (2017) Determinants of hazardous drinking among black South African men who have sex with men. Drug and Alcohol Dependence. 180: 14-21. 
  • Knox J, Reddy V, Lane T, Hasin D, Sandfort T. (2017) Substance use and sexual risk behavior among black South African men who have sex with men: the moderating effects of reasons for drinking and safer sex intentions. AIDS & Behavior. 21: 2023-2032.  
  • Knox J, Sullivan S, Urena J, Miller M, Vavagiakis P, Shi Q, Uhlemann AC, Lowy FD. (2016) Environmental contamination in the home and risk of recurrent community-associated Methicillin-resistant Staphylococcus aureus infection. JAMA Internal Medicine. 176: 807-815. 
  • Knox J, Uhlemann AC, Lowy FD. (2015) Staphylococcus aureus infections: transmission within households and the community. Trends in Microbiology. 23: 437-444. 
  • Knox J, Reddy V, Kaighobadi F, Nel D, Sandfort T. (2013) Communicating HIV status in sexual interactions: assessing social cognitive constructs, situational factors, and individual characteristics among South African MSM. AIDS & Behavior, 17: 350-359. 

Jose E. Diaz

José E. Diaz, PhD, is a SAETP post-doctoral research fellow in the MSPH Department of Epidemiology. He is interested in examining whether and how larger social and political contexts (e.g., public health policies, neighborhood environments) and social identities (e.g., race/ethnicity, gender) play a role in sexual minority health disparities. He is particularly motivated to strengthen our understanding of substance use disparities that exist among sexual minority populations. For instance, his current projects examine racial/ethnic and gender-based differences in sexual minority substance use behaviors. He completed his Ph.D. in Sociomedical Sciences with a concentration in Psychology at Columbia University in February of 2018. His dissertation work explored how cultural (e.g., acculturation), neighborhood (e.g., ethnic density), and syndemic factors (e.g., substance use) contribute to HIV-related risk among Latino men who have sex with men (MSM). His dissertation work was nominated for the Marisa de Castro Benton Dissertation Award in Sociomedical Sciences for its outstanding contribution to the field. Prior to his doctoral training, Dr. Diaz taught high school English in Spain through a model United Nations curriculum focused on population health and inequality.

Selected Publications

  • Diaz, J.E., Schrimshaw, E.W., Tieu, H.V., Nandi, V., Koblin, B., & Frye, V. (under review). Acculturation as a moderator of HIV risk behavior correlates among Latino men who have sex with men. 
  • Diaz, J.E., Greene, E.R., Philbin, M.M., Martins, S.S., & Mauro, P.M. Gender and racial/ethnic differences in past-month heavy alcohol use and past-year non-medical use of prescription opioids by sexual identity in U.S. adults. Poster presented at The College on Problems of Drug Dependence Annual Meeting, San Antonio, TX.
  • Diaz, J.E., Schrimshaw, E.W., Nandi, V., Koblin, B., Tieu, H.V., & Frye, V.  Ethnicity- and gay-related neighborhood-level correlates of HIV risk behavior among Latino men who have sex with men. Poster presented at the American Public Health Association 146th Annual Meeting and Exposition, San Diego, CA.
  • Martins, M., Diaz, J.E., Valiño, R., Kwate, N.O., & Abraido-Lanza, A. (2014). Havens of risks or resources? A study of two Latino neighborhoods in New York City. J Urban Health91(3), 477-88.


Marine Azevedo Da Silva, PhD, is a SAETP affiliated post-doctoral research fellow in the MSPH Department of Epidemiology. She is a social epidemiologist whose current research focuses on studying the impact of policies and social environments on adolescent substance use, substance use disorders and mental health. Her research is supported by the NIDA-Inserm Drug Abuse Research Fellowship. Prior to joining the SAETP, she worked in the Social Epidemiology research team at the Pierre Louis Institute of Epidemiology and Public Health (France) as a postdoctoral researcher, investigating the relationship between occupational status throughout the career, psychosocial work factors and suicide risk. Dr. Azevedo Da Silva earned her PhD in Public Health with a specialization in Epidemiology from the University of Paris-Saclay (French National Institute of Health and Medical Research - Centre for Research in Epidemiology and Population Health, France). Her dissertation research focused on the impact of the antidepressant medication use on cardiometabolic risk, and was supported by a fellowship from the Doctoral School of Public Health (EDPS, France). She earned her MPH from the Paris-Sud University (France) and her BS in Life Sciences from the Paris Descartes University (France).

Selected Publications

  • Azevedo Da Silva M, Gonzalez JC, Person GL, Martins SS. Bidirectional association between bullying perpetration and internalizing problems among youth. Journal of Adolescent Health, in press.
  • Melchior M, Nakamura A, Bolze C, Hausfater F, El-Khoury F, Mary-Krause M, Azevedo Da Silva M. Does liberalisation of cannabis policy influence levels of use in adolescents and young adults? A systematic review and meta-analysis. BMJ Open. 2019 Jul 10;9(7):e025880.
  • Azevedo Da Silva M, Younès N, Leroyer A, Plancke L, Lemogne C, Goldberg M, Rivière M, Melchior M. Long-term occupational trajectories and suicide: a 22-year follow-up of the GAZEL cohort study. Scand J Work Environ Health. Scand J Work Environ Health. 2018 Sep 16. pii: 3767.
  • Younès N, Rivière M, Plancke L, Leroyer A, Blanchon T, Azevedo Da Silva M, Melchior M. Work intensity in men and work-related emotional demands in women are associated with increased suicidality among persons attending primary care. J Affect Disord. 2018 Aug 1;235:565-573.
  • Azevedo Da Silva M, Balkau B, Roussel R, Tichet J, Fumeron F, Fagherazzi G, Nabi H, and the D.E.S.I.R. Study Group. Longitudinal association of antidepressant medication use with metabolic syndrome: Results of a 9-year follow-up of the D.E.S.I.R. cohort study. Psychoneuroendocrinology. 2016 Aug 21;74:34-45.
  • Azevedo Da Silva M, Dugravot A, Balkau B, Roussel R, Fumeron F, Elbaz A, Canonico M, Singh-Manoux A, Nabi H, and the D.E.S.I.R. Study Group. Antidepressant medication use and trajectories of fasting plasma glucose, glycated hemoglobin, β-cell function and insulin sensitivity: a 9-year longitudinal study of the D.E.S.I.R. cohort. Int J Epidemiology. 2015 Dec;44(6):1927-40.