I was selected by NASA and the European Space Agency (ESA) as a member of the Euclid Consortium in early 2013. Euclid is an approved ESA space mission scheduled for launch in the year 2020. It is a wide-field telescope designed to carry out multiple cosmic studies, with an emphasis on the study of the three-dimensional distribution of dark matter in the universe, in order to advance our understanding of the nature of the dark matter and dark energy. Dark energy currently dominates the mass-energy of the universe and acts as an anti-gravity, driving the current accelerated expansion of the universe. The Euclid mission will study the nature of dark energy using the tools of weak gravitational lensing and baryon acoustic oscillations.