Robert Boyle, a founder of modern chemistry, never formally studied or held a post within the university, but resided within the city to be part of the scientific community and was awarded an honorary degree. Notable scientists who spent brief periods at Oxford include Albert Einstein developer of general theory of relativity and the concept of photons; and Erwin Schrödinger who formulated the Schrödinger equation and the Schrödinger's cat thought experiment. Structural engineer Roma Agrawal, responsible for London's Shard, attributes her love of engineering to a summer placement during her undergraduate physics degree at Oxford.