Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)

I  Instructors of HLM workshops

Steve Raudenbush & Tony Bryk  

Steve Raudenbush is a professor in the Department of Sociology at the University of Chicago.

His research interests include: Analysis of Multilevel Data; and Methods for Studying Psychological Change Within Schools, Classrooms, and Families.

He considers his most significant achievement to date as having people use improved statistical methods to study children in educational settings and seeing research improve as a result. He has spent the last 10 years focusing on building into statistical models the fact that children are clustered into social settings rather than just solitary individuals. In addition, he has also presented workshops at national meetings to enable people to understand these methods.

Steve Raudenbush

Tony Bryk

Tony Bryk is the President of the Carnegie Foundation for the Advancement of Teaching. He is also Consulting Professor in Organizational Behavior at Stanford University.

His research interests include: Analysis of Multilevel Data; Research on School Organization and its Effects; and Socio-Political Organization of Applied Social Science.

I  Instructors of LISREL workshops

Karl Jöreskog & Ken Bollen

Karl Jöreskog

Karl Jöreskog is Professor Emeritus at Uppsala University (Sweden), Professor at the Norwegian School of Economics and Business Administration in Bergen (Norway) and Professor at the Norwegian School of Management in Oslo (Norway). His research interests include: multivariate analysis, factor analysis, covariance structure analysis, structural equation models, and statistical applications in behavioral and social sciences. Together with Professor Dag Sörbom, he developed the LISREL model and the LISREL computer program.

Ken Bollen is the Director of the Odum Institute for Research in Social Science and the Henry Rudolph Immerwahr Distinguished Professor in the Department of Sociology at the University of North Carolina, Chapel Hill. His research interests include Structural Equation Models and Comparative Research on Democracy. He wrote the standard reference book on SEM: Structural Equations with Latent Variables (1989, Wiley).

 Dag Sörbom
I  Instructors of LISREL workshops

Ralph O. Mueller & Gregory Hancock  

Ralph O. Mueller

Ralph O. Mueller is the Professor of Educational Leadership, Professor of Psychology, and Dean of the College of Education, Nursing and Health Professions (ENHP) at the University of Harford, CT. He is the author of an introductory SEM textbook and co-edited a more advanced text with Gregory Hancock: Structural Equation Modeling: A Second Course (2006, Information Age Publishing). He conducts regular SEM seminars for the American Educational Research Association and is a former chair of its special interest group on SEM. He serves on several editorial boards and is a charter member of the board of Structural Equation Modeling: A Multidisciplinary Journal. With Gregory Hancock he contributed a chapter to the Festschrift for Prof. Jöreskog.

Gregory Hancock is a professor in the Department of Measurement, Statistics and Evaluation at the University of Maryland, College Park. His SEM research interest lies primarily in latent variable experimental design and analysis, e.g., projects dealing with latent growth models, as well as the use of MIMIC models and structured means modeling to facilitate inference regarding latent construct means. He is past chair of the SEM special interest group of the American Educational Research Association. He also serves on the editorial board of a number of journals, including Structural Equation Modeling: A Multidisciplinary Journal. He contributed a chapter to the Festschrift for Prof. Jöreskog with Ralph Mueller.

 Gregory R. Hancock

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