He is a professor at Columbia University's Institute for Strings, Cosmology, and Astroparticle Physics.
葛林是哥伦比亚大学ISCAP（弦论、宇宙学和天体粒子研究中心）的教授。
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As their name suggests, astroparticle physicists focus on particles of cosmic provenance, rather than those produced in collider experiments on the ground.