After completing her PhD at Cornell, Susanna Siegel joined the Philosophy department at Harvard University in 1999. There, she was promoted to full professorship in 2005 and she became the Edgar Pierce Professor of Philosophy in 2011. She teaches metaphysics, epistemology, philosophy of mind and philosophy of language.
In 2012, Professor Siegel was named the Walter Channing Cabot Fellow at Harvard as a recognition for her book The Contents of Visual Experience and she also gave the Gareth Evans Memorial Lecture at Oxford. In 2013, Professor Siegel was appointed a Distinguished Visiting Professor of Philosophy at the University of Birmingham. She also holds a visiting position at the Centre for the Study of Human Nature at Oslo.