Professional Memberships
1997- Member of the American Psychological Association
1996 - Elected Member of the International Statistical Institute
1992 - Member of the American Statistical Association
1989 - Member of the Institute of Mathematical Statistics
1988 - Member of the Netherlands Society for Ordination and Classification
1988 - Fellow of the Royal Statistical Society
1986 - Member of the Classification Society of North America
1985 - Member of the Netherlands Society for Statistics and Operations Research
1982 - Member of the Psychometric Society