I am an experimental particle physicist interested in precision tests of the electroweak theory and QCD, and sensitive searches for new physics effects at low energies. The present theory of strong and electroweak interactions, the Standard Model, has been highly successful in describing most if not all currently seen phenomena. At the same time, the theory leaves many important questions unanswered. Why are there three quark and lepton generations with seemingly hierarchical mass structure ? What is the origin of matter-antimatter asymmetry in the Universe ? Is there a more complete description of particle interactions, including gravity, at higher energies ?

While our theoretical colleagues are working on possible answers to these questions, it is our role as experimentalists to guide them and help shape up or disprove new theories. New particle accelerators are being built or planned to study interactions at high energies. On the other hand, unique opportunities provided by precision electroweak measurements at lower energies complement the discovery potential of the highest energy colliders.