David Sampson is a Fellow Member of SPIE, on the Board of Directors, and Vice-Provost of Research and Innovation at the University of Surrey. He is also the next community member to answer our 'Why Light?' series. The series is leading up to the second annual International Day of Light this 16 May, and asks members of the SPIE community to explain why they feel light is so important. David has nearly thirty years’ research experience in photonics, optics, and microscopy, and applications in communications and biomedicine. He is an authority in optical coherence tomography, with several main interests including the microscope-in-a-needle. As a Board Member he serves on several committees for SPIE, including the Strategic Planning Committee and the Conference Program Committee, and regularly contributes to SPIE's conferences and journals. He took time out of his very busy schedule to answer for us what light means to him and to the greater global community. David Sam...