BIOGRAPHICAL NOTES 1989
JOHN C. DUFFY
John C. Duffy is Lecturer in Statistics, University of Edinburgh and research scientist, M.R.C.
Unit for Epidemiological Studies in Psychiatry. Research interests and publications in the
fields of epidemiology, causal modelling, survey methodology. Particular areas of expertise
include epidemiological applications in cataract, depression, alcohol-related problems and
suicide. Past member of RSS Social Statistics Section Committee, President of Association of
University Teachers (Scotland), joint prizewinner, best paper of 1984, study group for the use
of computers in survey analysis.
JELKE G. BETHLEHEM
Jelke G. Bethlehem studied mathematical statistics at the University of Amsterdam. After
obtaining his pre-doctoral degree, he was employed as Research Worker at the Statistical
Department of the Mathematical Centre in Amsterdam. His work concentrated on multivariate
statistical analysis and development of statistical software.
In 1978 he joined the Department for Statistical Methods of the Netherlands Central Bureau of
Statistics (C.B.S.), first as Research Worker and later as Senior Statistician. His main topics
were the treatment of nonresponse in sample surveys, in which he obtained his Ph. D., and
disclosure control of published survey data.
Now he is chief of the Statistical Informatics Unit (a research unit within the Automation
Department), which concentrates on the development of standard software for processing survey
data. The important fields of study are the Blaise System for computer assisted survey data
collection and data processing, tabulation packages, and software for weighting sample survey
WOUTER J. KELLER
Wouter J. Keller studied Electronics (BSc, cum laude) and Applied Mathematics at the Twente
University of Technology (MSc, cum laude). After his study he was employed as Associate
Professor at the Institute for Fiscal Studies of the Erasmus University (Rotterdam) and
obtained his PhD (cum laude) in Econometrics.
In 1979 he joined the Netherlands Central Bureau of Statistics as head of the Department of
Statistical Methods and in 1987 he became the head of the Automation Department. Also since
1982 he is part-time Professor of Econometrics and Informatics at the Free University of
He works nowadays mainly on Automation of Survey Processing, Computer Assisted Telephone
Interviewing (CATI), Computer Assisted Personal Interviewing (CAPI), and other methods for
collecting, correcting and processing survey data, software development (software for
statistical and econometrical analysis and time scheduling problems), microcomputers
(hardware and software, in particular statistical software), management of research and EDP