Maisy is narrated by Neil Morrissey and an American theoretical physicist who is a professor at what school?
Maisy:  It is narrated by Neil Morrissey and Brian Greene in the US version. Brian Greene: Brian Randolph Greene (born February 9, 1963) is an American theoretical physicist, mathematician, and string theorist. Brian Greene:  He has been a professor at Columbia University since 1996 and chairman of the World Science Festival since co-founding it in 2008.
Columbia University