Marc Wittmann, Ph.D., is a research fellow at the Institute for Frontier Areas in Psychology and Mental Health in Freiburg, Germany. He studied psychology and philosophy at the Universities of Fribourg, Switzerland, and Munich, Germany. He received his Ph.D. at the Institute of Medical Psychology, University of Munich. From 2000 to 2004 he was head of the Generation Research Program, Bad Tölz, University of Munich. Between 2004 to 2009 he was a research fellow in the department of psychiatry at the University of California, San Diego. He is the author of the MIT Press books Felt Time: The Psychology of How We Perceive Time published in 2016 and Altered States of Consciousness: Experiences Out of Time and Self published in 2018.