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The STEM Development Team

back to STEM Contents Page

The following is a list of current contributors to STEM

Please see the STEM Community Page to learn how you can join!!

  • Stefan Edlund is co-lead for the Eclipse STEM Project. He is a senior software engineer in the Healthcare Research team at IBM Almaden developing new technologies related to the public health domain. Stefan has over 10 years experience in IBM, having worked on a broad area of technologies such as DB2 query visualization, intelligent personal calendars, exploratory Lotus applications, location based services and more recently in content management and content replication as well as development of an email search and discovery product (IBM eDiscovery Manager). Stefan's current research interests include development of new STEM disease models including diseases involving multiple populations and multiple serotypes. Stefan holds a MS degree in computer science from the Royal Institute of Technology in Stockholm. He currently holds over 15 US patents. (
  • James H. Kaufman Ph.D., is co-lead for the Eclipse STEM Project. He is manager of the Public Health Research project in the Department of Computer Science at the IBM Almaden Research Center. James received his B.A. in Physics from Cornell University and his PhD in Physics from U.C.S.B. He is a Fellow of the American Physical Society and a Distinguished Scientist of the ACM. He is one of the original creators of STEM.(
  • Ahmad Swaid is a software developer, worked for more than 15 years on ERP Systems and open source solutions based on OSGi technology. Nowadays, Ahmad is mostly interested in software design and cloud solutions. (
  • Matthew Davis is a graduate of the University of Oklahoma where he earned both his BS and MS in computer science. During his time at OU, he spent a significant amount of time developing a series of web portals with the aim of aiding in building student communities. These applications were later open sourced and adopted by several universities across the United States. Additionally, he spent time teaching in the computer science department at OU, primarily as an instructor for a senior-level computer graphics course. During the summer of 2006, Matt participated in the IBM Extreme Blue internship program at Almaden. He later joined IBM Research where, as an Eclipse Committer on the OHF project he helped develop the Eclipse Open Healthcare Framework (OHF) Bridge. The OHF Bridge is a web services platform that enables access to OHF actor profiles from non-Java applications. Matt is currently working on a server side implementation of STEM. (
  • Judith V. Douglas is the lead technical writer for STEM. She coordinates STEM documentation and is coauthor on many of the STEM scientific publications. She holds master's degrees from Northwestern University and the Johns Hopkins Bloomberg School of Public Health and has published extensively in healthcare informatics. (
  • Barbara A. Jones, Ph.D., is a theoretical physicist at the IBM Almaden Research Center. She has contributed many mathematical algorithms, and has a long-term interest in applying advanced mathematical and physics methods to problems in epidemiology.
  • Justin Lessler, Ph.D., is in the Epidemiology Department at the Bloomberg School of Public Health at the Johns Hopkins University in Baltimore, Maryland.
  • Yossi Mesika is a research staff member in Healthcare and Life Sciences, at the IBM Haifa Research Lab in Haifa, Israel. He received his B.Sc. in Computer Engineering from Technion, the Israel Institute of Technology in Haifa. He joined IBM in 2003 and has contributed to several Healthcare projects that deal with interoperability. An Eclipse committer, he has also contributed to the WADO component in the Eclipse Open Health Framework. (
  • Roni Ram is a research staff member in the Healthcare and Life Sciences group, IBM Haifa Research Lab. She received her B.Sc. and M.Sc. in computer sciences from the Technion, Israel Institute of Technology in Haifa, Israel. Since joining IBM in 1996, she has worked on several projects involving user interfaces and IP telephony. For the last three years, she has been working on interoperability among health care organizations with focus on the public health domain.
  • Arik Kershenbaum worked part-time at the IBM Haifa Research Lab while he was a doctoral student at the Department of Evolutionary and Environmental Biology at the University of Haifa, Israel (personal website). He developed add-ons and applications for STEM in the fields of zoonotic disease spread, particularly vector borne diseses. In addition, he was looking at other collaborative applications for the STEM framework in the fields of ecology and zoology, where ecosystems can be represented as a graph network. He has an undergraduate degree in Natural Sciences from the University of Cambridge in England, and is currently a postdoctoral fellow at the National Institute for Mathematical and Biological Synthesis (
  • Werner Keil is freelance IT Architect, Eclipse RCP Developer and Consultant having worked for governments and Global 500 companies worldwide. He has worked for more than 30 years as project manager, software architect, analyst and consultant on leading-edge technologies for Banking, Insurance, Telco/Mobile, Media and Public sector/Healthcare. Werner is committing member of the Eclipse Foundation and Babel Language Champion (German). As well as active member of the Java Community Process, including his role as UCUM/Java Lead, JavaEE EG and Executive Committee. As well as the Jakarta EE Working Group and Specification Committee.
  • Matthias Filter is a research staff member at the Federal Institute for Risk Assessment(BfR), Germany.
  • Jan Wigger is a research staff member at the Federal Institute for Risk Assessment(BfR), Germany. He studied bioinformatics at the University of Hamburg, Germany and worked in the field of mathematical modelling and molecular dynamics simulations for several years. Jan is an Eclipse Committer and works on modelling food chain safety.
  • Armin A. Weiser, Ph.D. is a research staff member at the Federal Institute for Risk Assessment(BfR), Germany, and is also a committing Eclipse member. He studied mathematics and received his Ph.D. in theoretical biology from the HU Berlin.
  • Christian Thoens was an intern in the Healthcare Research team at IBM Almaden and now works at the Federal Institute for Risk Assessment (BfR) in Berlin, Germany. Christian holds a MS degree in computer science from Bielefeld University. (
  • Kun (Maggie) Hu, Ph.D., is a research staff member in the Healthcare Research team at IBM Almaden. She received her Ph.D. in Industrial and Systems Engineering from Virginia Tech on May 2011. She has published several peer-reviewed journal and conference articles which mainly focus on different methodologies (i.e., differential-equation-based model/system dynamics, agent-based model) used to model various infectious diseases and interventions, e.g., polio, dengue fever.(
  • Toshiaki Kurokawa is CSK Fellow at CSK Corporation in Tokyo, Japan ( He is also an Affiliated Fellow at National Institute of Science and Technology Policy (NISTEP, Ministry of Education, Culture, Sports, Science and Technology (MEXT). He worked for Toshiba and IBM before joining CSK. He has been engaged in the research of programming languages, object-orientation, and standardization of metadata. His current interests include human resource development and Design Thinking. He is one of founders of ICES (International Cooperation for Education about Standardization
  • Isabel Fan is a student at the University of Pennsylvania, pursuing Bachelor's Degrees in Computer Science and Biology (Computational Biology Concentration).
  • Jiwon Youm, MBA, is a Director at SunGard Availability Services. As a product manager, he has launched disaster recovery, virtualization, and server consolidation related solutions while at SunGard, Symantec and IBM. He earned his MBA from the Wharton School of Business.
  • Daniel Doerr is a graduate student in bioinformatics at Bielefeld University. His thesis project focuses on developing new methods in comparative genomics. Daniel first contributed to STEM during an internship in the Healthcare Research team at IBM Almaden.
  • Kassaye Y. Yigzaw is a PhD student in Computer Science at University of Tromsø, Norway. He first contributed to STEM during his MSc. study in Telemedicine and E-Health at University of Tromsø. Kassaye received his Bachelor degree in Electrical Engineering from Hawassa University, Ethiopia.
  • Kezban Yagci Sokat is an intern in the Healthcare Research Team at IBM Almaden. She is a PhD candidate in Industrial Engineering and Management Sciences at Northwestern University. Her research focuses on infectious disease modeling.
  • Roslyn Hickson, Ph.D., is an applied mathematician at IBM Research - Australia, with particular expertise in infectious disease modelling.
  • Emily Nixon is a BBSRC DTP PhD student in Biological Sciences at the University of Bristol. Her research focuses on mathematical modelling of Psoroptes ovis (Sheep scab), a parasitic disease in Sheep which causes great economic losses to farmers in the UK and elsewhere. As part of her DTP she will be undertaking an internship at the Department for Environment, Food and Rural Affairs.

STEM Developers Emeritus

  • Iris Eiron was a researcher at the IBM Almaden Research Lab before relocating to the IBM Research Lab in Haifa, Israel, where she continues to contribute to the development and implementation of a national health care information infrastructure. Together with Matthew Hammer and James Kaufman, Iris was one of the creators of the original version of STEM.
  • Daniel Ford, Ph.D., was a committer and former project co-lead for STEM. He designed and implemented initial versions of STEM, including the core composable graph framework that gives STEM its ability to represent arbitrary models. He received his Ph.D. in Computer Science from the University of Waterloo.
  • Matthew Hammer was an undergraduate at the University of Wisconsin. He is majoring in computer science with an interest in the field of programming languages. Mr. Hammer worked as an IBM research intern in the summers of 2003 and 2004. Together with Iris Eiron and James Kaufman, Matthew was one of the creators of the original version of STEM.
  • Ohad Greenshpan is part of the Healthcare and Life Sciences group at the IBM Haifa Research Labs. Mr. Greenshpan is an MSc student for Bioinformatics in Ben-Gurion University, concentrating on Protein Folding algorithms and Structural Bioinformatics. Prior to joining IBM, Mr. Greenshpan was a member of the Genecards team in Weizmann Institute of Science.
  • Nelson A. Perez was a software engineer for the Healthcare Informatics Research Group at IBM Almaden. Nowadays, Nelson is mostly interested in software engineering, distributed computing, social computing, and web technologies. He holds an MS degree in computer science from the University of California at Riverside.
  • Dirk Reuter, Ph.D., a research staff member at the Federal Institute for Risk Assessment (BfR), Germany, was an Eclipse Committer. He studied physics and received a Ph.D. in biochemistry from University of Cologne. He has worked in electrophysiology, studying properties and behaviour of ion channels. He has also been involved in gene expression profiling projects on the Affymetrix platform.
  • John Thomas is a Java developer for IBM. He was previously one of the lead programmers for the IBM Almaden TSpaces project and also a member of the OptimalGrid Project at the Almaden Research Center. (
  • Joanna "Jo" Conant. Jo graduated from Middlebury College in 2003 and is now a medical student at the University of Vermont College of Medicine. She is considering a career in Public Health, though also exploring other specialties. An avid skier, Jo moved from the deserts of Phoenix, Arizona, to the mounts of Vermont, where she enjoys skiing 100+ days each year. She now lives in Warren, Vermont, with her husband and dog.
  • Charles "Chuck" Hulse. Chuck graduated from Bucknell University in 1982, received his PhD in Chemistry from the University of Virginia in 1989 and his MD from the University of North Carolina at Chapel Hill in 1995. He completed his family medicine residency at the Department of Family Medicine of the University of Vermont College of Medicine in 1998. After serving as chief resident, he joined the facult and is now an Associate Professor of Family Medicine. A native of Eastern Long Island, Chuck has an intense interest in nature and is an aspiring nature photographer. He lives with his family in the beautiful Champlain Islands where he raises heirloom vegetables, fruits and berries, bees, chickens, goats, and sheep.

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