The innermost component of the CMS detector is a pixel tracker which is used to reconstruct charged particle trajectories. It is of crucial importance in identifying the interaction vertices in proton-proton collisions as well as the displaced vertices from decays of particles such as the bottom and charm hadrons. The latter is an important requirement in identifying jets arising from the fragmentation of bottom quarks. I will discuss the measurement of the alignment of the pixel detector using cosmic ray and LHC collision data during the period 2012–2014. The CMS pixel detector was replaced in the beginning of 2017 (Phase 1 upgrade). A new pixel detector is currently being designed (Phase 2 upgrade) to cope with the high radiation and collision rates at the high luminosity LHC. In this talk, I will review my activities related to the development of the CMS Phase 1 and Phase 2 pixel detectors.
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