Prof. Ashutosh Kotwal recently gave lectures at the Hadron Collider Physics Summer School organized jointly by CERN and Fermilab. The Summer School was attended by about 130 students, mostly from Europe and North America but some also from other continents. Kotwal's lectures focused on the history of discovery through precision measurements in the field of particle physics and the current status of precision measurements. He described how these measurements can either confirm the consistency of the Standard Model of particle physics including the newly-discovered Higgs boson, or find evidence for new laws of physics beyond this established theory. He explained the techniques, prospects and challenges for performing more precise measurements at Fermilab and the LHC, using the example of the W boson mass as an observable sensitive to new physics.