Frank Siebern-Thomas European Commission   rue de la Loi, 200 Bruxelles, 1049 Belgium   frank.siebern@cec.eu.int     Biographical Sketch: Economist at the Employment Analysis Unit of DG Employment and Social Affairs   Primary Research Focus: labour market dynamics, labour mobility, education, quality in work, microeconometrics, panel data   JEL Areas: J0 : Labor and Demographic Economics: General C5 : Econometric Modeling: General