Research Staff

Claire Roy – Research Assistant
Ms. Roy recently graduated from the University of Nebraska-Lincoln where she obtained her BS in Psychology with a minor in Biology. Currently she is working toward her MPH at George Washington University. Her research interests include Health Advocacy and Health Promotion with a special focus on research within the Veteran population and advocating for Veteran healthcare needs.
Email Claire Roy

Cynthia Gutierrez – Epidemiologist
Ms. Gutierrez, MPH, holds a Master’s degree in Global Health Epidemiology from the University of Michigan School of Public Health, and a Bachelor’s degree in Biology with an emphasis in cellular and molecular biology from California State University, Channel Islands. During her time at the University of Michigan, her research included longitudinal analysis of the effects of market integration on nutritional status of adults. Ms. Gutierrez previously held an internship through the University of Michigan in rural Ecuador, summarizing and presenting the results of a ten-year longitudinal study to the participating communities. Her research interests include vector-borne diseases, health communication in middle- and low-income settings, and nutritional epidemiology.
Email Cynthia Gutierrez

Gina Nicholson – Health Economist
Ms. Nicholson builds evidence to answer strategic research questions in multiple therapy areas. Her deep research experience centers around outcomes research design and analysis. Within health economics and market access, Gina focuses on developing product value strategy, having developed HEOR evidence generation strategies, value stories/dossiers, and evidence synthesis.
Email Gina Nicholson

Heidi Reichert – Biostatistician
Ms. Reichert, MA, earned her graduate degree at the University of Michigan. She has 10 years of experience as a statistical consultant and analyst for a diverse set of projects involving medical record data, claims data, survey data, and data from the University of Michigan Dioxin Exposure Study. Her methodological interests include risk adjustment methods and models for clustered and longitudinal data. She has extensive data management and programming experience in Stata and also uses SAS and R. Ms. Reichert has given client workshops on data analysis planning and data management, and lectured on statistical methods at the University of Michigan School of Public Health. She has presented her work at methods conferences including the American Statistical Association’s International Conference for Health Policy Statistics and the Conference on Statistical Practice. Co-authored manuscripts by Ms. Reichert appear in Annals of Internal Medicine, Infection Control and Hospital Epidemiology, Journal of the American Geriatrics Society, Journal of General Internal Medicine, Blood Advances and Journal of Vascular and Endovascular Surgery.
Email Heidi Reichert

Jenna Coalson – Epidemiologist
Dr. Coalson, PhD, MPH, brings specialized knowledge on infectious diseases. Ms. Coalson recently completed her PhD in Epidemiologic Sciences at the University of Michigan School of Public Health, where she researched infectious disease transmission dynamics.  Her dissertation research focused on defining the role that asymptomatic cases play in the transmission of malaria parasites. She previously obtained an MPH in International Health Epidemiology from the University of Michigan and a BA in Human Biology, concentrating on The Biological and Social Aspects of Infectious Disease, from Stanford University.  She has experience in both laboratory and field epidemiologic research, having had internships in the San Mateo County Department of Public Health and the Kintampo Health Research Centre in Ghana and having worked briefly in the laboratories of the Stanford University Microbiology and Immunology Department, the University of Nebraska Medical Center Department of Cellular and Integrative Physiology, and the Malawi College of Medicine.  Prior to beginning work with EpidStat, she worked for two years as a Scientist in the Exposure Assessment and Dose Reconstruction group at Exponent, Inc., where she assisted with a large occupational cohort study and performed various literature reviews on issues relating to asbestos exposure from consumer products, incidence and prevalence of various osseous and blood-related diseases and cancers, and treatment patterns in metastatic breast cancer.
Email Jenna Coalson

Jessica Yaser – Research Assistant
Ms. Yaser is working toward a Master’s degree in Occupational & Environmental Epidemiology at the University of Michigan School of Public Health, expected May 2019. She holds a Bachelor’s degree in Public Health from Purdue University with concentrations in Behavioral Social Sciences and Environmental Health. Ms. Yaser previously worked for the Vanderburgh County Health Department in Evansville, Indiana, where she helped design a health promotion program to reduce fetal and infant mortality. Her research interests include nutritional epidemiology, the built environment, and occupational exposures.
Email Jessica Yaser

Julie Hahn – Epidemiologist
Ms. Hahn, MPH, holds a Master’s degree in General Epidemiology from the University of Michigan School of Public Health, and Bachelor’s degree in Radiologic Science from the University of North Carolina Chapel Hill. During her time at the University of Michigan, her research included evaluating associations between diagnosed and undiagnosed diabetes and different dimensions of depression among Asian Americans using NHANES data. Ms. Hahn previously held an internship at the University of Michigan where she worked on a project revisiting the Tecumseh Community Health Study retrieving historical study documents and investigating survey methods to recreate a characterization of the Tecumseh community and the participants of the study. She has experience in literature review, statistical methods, and conducting statistical analysis using SAS. Her research interests include chronic diseases and nutritional epidemiology.
Email Julie Hahn

Lauren Bylsma – Epidemiologist
Ms. Bylsma earned her MPH at the University of Michigan School of Public Health in the Epidemiology and International Health program. While in school, she worked as a research assistant on a prospective cohort study evaluating the effects of air pollution on pre-term birth in Mexico City and interned at the Universidad Nacional Autónoma de México in Mexico City managing nutritional data and analyzing fetal growth effects of maternal dietary patterns. In her 5 years at EpidStat, Ms. Bylsma has worked in the areas of cancer epidemiology, nutritional epidemiology, pharmacoepidemiology, and the epidemiology of rare diseases. She has conducted several large systematic literature reviews and meta-analyses across multiple therapeutic areas. Ms. Bylsma has also taught an integrative capstone seminar in the Department of Public Health at Calvin College and has presented work at conferences across research settings, including American Society of Hematology, European Society for Medical Oncology, Experimental Biology, and International Society for Pharmacoeconomics and Outcomes Research. She has co-authored numerous manuscripts in journals such as Nutrition Journal, European Journal of Vascular and Endovascular Surgery, Cancer, Blood Advances, and the American Journal of Clinical Nutrition.
Email Lauren Bylsma

Luke Shenton – Epidemiologist
Mr. Shenton, MPH, earned a Master’s degree in Epidemiology from the University of Michigan School of Public Health and a Bachelor of Science degree in Neuroscience from the University of Michigan. His research interests include maternal and child health, social, and, infectious disease epidemiology. During his time at the University of Michigan, Mr. Shenton conducted analyses on large nationally representative data sets to evaluate vaccination program performance in low and middle income countries. He has authored publications in journals such as Maternal and Child Health Journal and Vaccine. Mr. Shenton has experience in literature review, data collection, statistical methods, and programming in SAS and R.
Email Luke Shenton

Lynn Zwica – Senior Research Associate (Exposure Scientist)
Ms. Zwica, MS, has over 15 years of experience working in academic research and private consulting, including extensive experience in the area of litigation support. Ms. Zwica is a trained exposure scientist, having obtained MS degrees in both Environmental Health and Industrial Hygiene at the University of Michigan School of Public Health as part of the Hazardous Substances Academic Training Program. She also holds a BS in Chemical Engineering from the University of Michigan. Ms. Zwica’s scientific interests include occupational and environmental exposure assessment, risk assessment, and cancer etiology, with a focus on lymphohematopoietic disease and its relationship to solvent exposure. As an academic researcher she played a significant role in the design and conduct of numerous projects most notably as the household dust sampling coordinator for the University of Michigan Dioxin Exposure Study where she oversaw and participated in the development of the sampling protocol as well as supervised the sampling and handling of over 700 household dust samples. In the private sector, Ms. Zwica has been involved in industry research projects as well as provided litigation support to numerous clients, primarily focusing on exposure to chemicals and cancer.
Email Lynn Zwica

Neha Mandava – Epidemiologist
Ms. Mandava, MPH, holds a Master’s degree in General Epidemiology at the University of Michigan School of Public Health and Bachelor’s degrees in Biology and Politics from Willamette University. Her research at the University of Michigan included literature reviews for chronic illnesses, such as Type II Diabetes and Hypertension. Ms. Mandava previously held an internship at the Karmanos Cancer Institute where she collaborated on a study examining depression in cancer patients and the brain-derived neurotrophic factor gene. She has experience conducting statistical analysis using SAS and R and her research interests include chronic illnesses, cancer, and genetics.
Email Neha Mandava

Naimisha Movva – Epidemiologist
Ms. Movva, MPH, holds a Master’s degree in Chronic Disease Epidemiology from the Yale School of Public Health and Bachelor’s degrees in Biological Sciences and Psychology from the University of Delaware. Her research interests include maternal and child health, nutritional, and perinatal epidemiology. During her time at Yale University, Ms. Movva evaluated how the Supplementary Program for Women, Infants, and Children (WIC) used evidence to drive programmatic decision making to encourage more evidence-based breastfeeding policies. She previously held an internship at the University of Oxford through the Value Based Healthcare Programme where she evaluated the effectiveness of the Quality Outcomes Framework, a pay-for-performance initiative in England. Ms. Movva also has experience conducting statistical analyses and teaching statistical programming.
Email Naimisha Movva

Stacey Rosenzweig – Epidemiologist
Ms. Rosenzweig, MPH, earned her Master’s degree in Epidemiology from the University of Michigan School of Public Health and BA in Biology from Whitman College. During her time at Michigan, Ms. Rosenzweig conducted analyses on partial-term births, menopausal hormone therapy and ovarian cancer survival using data from the Ovarian Cancer Association Consortium. She also spent a summer in Dar es Salaam, Tanzania collecting long term survival data from a Burkitt’s lymphoma clinical trial and evaluated the factors affecting survival for children enrolled in the trial. Prior to receiving her MPH, Ms. Rosenzweig worked at a small biotech company in Berkeley, CA helping to manage immuno-oncology clinical trials in mesothelioma, ovarian, and pancreatic cancer. Ms. Rosenzweig has experience in literature review, data collection, statistical methods and programming in SAS and Stata.
Email Stacey Rosenzweig

Susan T. Pastula – Epidemiologist
Ms. Pastula, MPH, has 20 years of epidemiology experience including research, project management, data collection, and analysis.  As an Epidemiologist, she coordinated occupational health studies funded jointly by company and unions. She was instrumental in the design, development, and field training of an in-house injury surveillance system for use in manufacturing locations.  She also analyzed employee health claims data related to chronic conditions and healthcare use.  Ms. Pastula has worked in university, industry, and consulting settings and has conducted research in occupational, environmental, pharmacoepidemiology, drug development, and the safety of drugs and medical devices.  She has published in the Journal of Occupational and Environmental Medicine, the International Journal for Quality in Health Care, and the American Journal of Industrial Medicine.
Email Sue Pastula

Sarah Irvin – Epidemiologist
Ms. Irvin, MS, received her Master’s degree from George Mason University. She holds a B.Sc. in pre-medicine biology from Washington Adventist University. Ms. Irvin spent over five years at Exponent, Inc. in the health sciences consulting area including projects related to epidemiology, toxicology, mechanistic biology, and food and chemical regulatory science.  Ms. Irvin performed research activities on the toxicological properties of dioxin, and maintained an extensive database of literature on dioxin and its mechanisms of action.  She was also the senior research assistant on a large occupational epidemiology study of the mortality of over 20,000 pharmaceutical workers and her work included the collection of primary occupational data, validation of the assembled cohort, vital status ascertainment, working with over 20 states regarding the acquisition of death records, and assisting in the mortality analysis and report creation. Additional projects in which Ms. Irvin was involved included the safety assessment of chemical ingredients in cosmetic products, exclusive use registrations of certain agricultural active ingredients, literature reviews of various compounds for their mechanisms of action and safety in food products, and data abstractions from literature on breast cancer drugs and their health effects.
Email Sarah Irvin

Xiaohui Jiang – Biostatistician
Ms. Jiang, MS, has more than 10 years of experience as a biostatistician. She has provided data management and analytic expertise on a broad range of projects including evaluations of cancer risk among occupational cohorts, meta-analyses, and the University of Michigan Dioxin Exposure Study.  Ms. Jiang has extensive experience in statistical analysis using many software platforms including SAS, STATA and R Statistical Software. She has co-authored multiple publications in the Journal of Occupational and Environmental Medicine, Chemosphere, and Environmental Science & Technology.
Email Xiaohui Jiang