Zef Wolffs promoveert op het proefschrift: 'Higgs, the Measurement of a Lifetime. Probing the Higgs Boson Lifetime via Its Off-Shell Production and Decay to W Boson Pairs with the ATLAS Experiment at the LHC'. Promotor is prof. dr. I.B. van Vulpen. Copromotor is dr. H.L. Snoek.