Lisa Randall studies theoretical particle physics and cosmology at Harvard University, where she is Frank B. Baird, Jr., Professor of Science. A member of the National Academy of Sciences, the American Philosophical Society, and the American Academy of Arts and Sciences, she is the recipient of many awards and honorary degrees. Professor Randall was included in Time magazine's "100 Most Influential People" of 2007 and was among Esquire magazine's "75 Most Influential People of the 21st Century." Professor Randall's two books, Warped Passages (2005) and Knocking on Heaven's Door (2011) were New York Times bestsellers and 100 Notable Books. Her stand-alone e-book, Higgs Discovery: The Power of Empty Space, was published in 2012.

Carrington MacDuffie is a recording artist, writer, and voice actor who has narrated over 100 audiobooks and received numerous AudioFile Earphones awards and 6 Audie finalists. Her original audiobook of poetry and music, Many Things Invisible, was nominated for an Audie in 2 categories. Kliatt says, 'MacDuffie's reading is amazing.'