Staffing and Contact Information

Data and Visualization Services Consultants

Data and Visualization Services consultants can help with a variety of data projects and related computing problems. We are available weekdays by appointment or according to our walk-in schedule.

Learn more about our areas of expertise below:


Joel Herndon

Joel Herndon

Head, Data and Visualization Services
Phone: (919) 660-5946
Location: 227 Perkins
Twitter: duke_data
Expertise: Data management, stata, R, SAS, online mapping tools, databases, data processing

I joined Duke University Libraries in 2003. Before coming to Duke, I was the head of the Electronic Data Center at Emory University Libraries. As the head of DVS, I lead the department, coordinate programs and services and act as a liaison with other data groups both at Duke and beyond. As part of the department's consulting services, I work with researchers on a range of questions about data management (both planning and implementation), data visualization and digital mapping projects.

Mark Thomas

Mark Thomas

GIS Librarian
Phone: (919) 660-5853
Location: 233 Perkins
Expertise: Software (ArcGIS, Excel, online mapping tools), economic literature, goverment data sources (all formats), maps

I have been working in Data and Visualization Services since its inception in 2007 and currently serve as the subject librarian for economics and business, geographic information systems (GIS), geography, maps and U.S. federal government documents. I began working at Perkins Library in 1996, and from 1990-1996, I worked as a librarian specializing in government documents and maps at Texas A&M University. I earned a Master of Library and Information Science at the University of Texas at Austin and a B.A. in Economics from Rice University.

Angela Zoss

Angela Zoss

Data Visualization Coordinator
Phone: (919) 684-8186
Location: 226-A Perkins
Twitter: duke_vis
Expertise: Software (Excel, Tableau, Python, SQL), data processing, data visualization, network analysis, regular expressions, text analysis, web visualizations

I began working as the Data Visualization Coordinator for Data and Visualization Services in 2012. While pursuing my doctorate in Information Science from Indiana University, I spent three years as a research assistant, focusing on information visualization projects and instruction. My research spans a wide range of subjects and methods — from qualitative analysis of interview and observational data to pattern detection in large, quantitative datasets. I hold a Master of Communication from Cornell University and have complementary training in cognitive science and computer science. I am happy to help with all phases of the data analysis cycle, and I am especially familiar with data processing/formatting and the design of visualizations and interactive systems. I teach workshops on data visualization, text analysis and related software tools.

John Little

John Little

Librarian/Integrated Library Systems Supervisor
Phone: (919) 627-7795
Location: 226-A Perkins
Expertise:  data processing, infrastructures, project planning, regular expressions, systems analysis

I am a recent member of Data and Visualization Services and a longtime member of the Duke University Libraries staff. My current interests are bootstrapping “Big Data” developments, helping library users implement new data tools and exploring data storage solutions. I earned a B.A in sociology with concentrations in computer science and political science from the University of North Carolina at Greensboro, and I earned my Master of Library and Information Science from the University of North Carolina at Chapel Hill.

John Pormann

John Pormann

Research Computing Consultant
Phone: (919) 660-5865
Location: 030X Bostock
Expertise:  Infrastructures, systems analysis, programming

I join DVS with a background in high-performance and scientific computing, with a focus in parallel computing for simulation and modeling. I have also done extensive work with IT infrastructure and system architecture planning. Most recently, I have begun looking at customized research environments (virtual and physical, local or cloud) to enable researchers to deploy the software they need to advance their work. I earned a B.E. in Computer Engineering from Stevens Institute of Technology and M.S. and Ph.D. in Electrical and Computer Engineering from Duke University.

Ryan Denniston

Ryan Denniston

Data Services Intern
Location: 226 Perkins
Expertise: Software (ArcGIS, Microsoft Access, online mapping tools, R, Stata), databases, data processing, scripting

I joined Data and Visualization Services in 2010 after graduating from Duke University with a doctorate in sociology. I am familiar with OLS and generalized linear models and have extensive experience producing thematic maps with diverse data sources in ArcGIS. I also am familiar with Visual Basic, the scripting environment used in the Microsoft Office suite, and I am especially interested in database construction and manipulation in Microsoft Access. I teach workshops on using statistical packages, particularly Stata.