The GenTAC Data Coordinating Center (DCC)

The GenTAC DCC is operated by RTI International and a multidisciplinary team with expertise in epidemiology, project management, clinical research, data management, statistics, and information technology. RTI is one of the world's leading research institutes, dedicated to improving the human condition by turning knowledge into practice. The staff of more than 2,800 provides research and technical services to governments and businesses in more than 40 countries in the areas of health and pharmaceuticals, education and training, surveys and statistics, advanced technology, international development, economic and social policy, energy and the environment, and laboratory testing and chemical analysis.

DCC Team


Photo of Barbara Kroner

Barbara Kroner, PhD, MPH
Principal Investigator

Barbara L. Kroner, MPH, PhD, a senior epidemiologist, has been with RTI since 1983. She is the Project Director for GenTAC and has oversight responsibility for all technical, operational, and financial activities related to the contract. She directs large-scale international surveys on the epidemiology of retroviruses, cancer, and hemophilia. Dr. Kroner also manages the Multisite Studies Design Coordination and Analysis Program within the Statistics and Epidemiology Unit. She oversees a staff of 40 who work almost exclusively on international multisite epidemiological studies. Dr. Kroner has frequently been invited to speak at scientific meetings worldwide and to provide consultation in epidemiology and data analysis to investigators conducting studies of factors associated with hemophilia. She has also published extensively in this area.


Liliana Preiss, MS

Liliana Preiss, MS, a research statistician, has been working on epidemiology and public health projects at RTI since 1996. She provides statistical support to the GenTAC investigators including analyses for manuscripts and other ongoing research. Ms. Preiss has extensive experience in a wide range of statistical methods including analysis of variance and covariance, linear and logistic regression, survival analysis with fixed and time-dependent covariates, sensitivity and specificity analysis, and tests for comparison of independent and non-independent populations. She is also proficient in analysis of complex survey data, multivariate analysis, and competing risks. Ms. Preiss has co-authored numerous papers related to her project work.


Danny Ringer
Biospecimen Manager

Danny Ringer is an experienced biospecimen manager who has worked in the field of biorepository management and biospecimen science for more than 30 years. He is responsible for ensuring that the collection, processing, storage, and shipping of biospecimens are comparable across collection protocols and sites. He has acquired a broad range of research and clinical technical skills related to biospecimen collection and management. His technical expertise covers specimen collection and processing procedures, preservation methodologies, inventory control, domestic and international shipping regulations, clinical and research bioassay applications, logistics and cold-chain management, and biorepository design and management.

Photo of Tabitha Hendershot

Tabitha Hendershot
Senior Project Manager

Tabitha Hendershot has been with RTI since 1990 and has extensive experience in large-scale, multisite epidemiological studies. She is the senior project manager and is responsible for the day-to-day operations of the Registry. Her experience in study and survey design includes instrument design, specimen collection, human subjects’ protections, field operations training field and data collection staff, writing manuals, and monitoring adherence to protocols. Ms. Hendershot also recruits, trains, and supervises field and telephone interviewers. Moreover, she has experience with studies that require locating, contacting, and interviewing hard-to-reach populations, such as homeless people and people who have drug or alcohol addictions.


Photo of Kevin Wilson, MS
Kevin Wilson, MS
Systems Analyst

Kevin Wilson, MS, has been with RTI since 2005. He is responsible for maintaining the secure data management system for collection of data. Mr. Wilson’s research focuses on the application of graph-based data mining techniques to application domains, including statistical machine translation, natural language processing, and systems biology. He has technical experience in the areas of Web application design, programming, and training. Mr. Wilson has extensive experience in developing and analyzing surveys and performing educational research, leading to the development of data management and reporting systems using a variety of technologies. He also has experience in the software development lifecycle, database design, and normalization.