Peplow has a Master's degree in Chemistry from the University of Oxford and a PhD in Organometallic Chemistry from Imperial College London (1995-1998). He spent a year as a post-doctoral fellow at McMaster University, Canada. In 2001 he completed a MSc in Science Communication from Imperial College London.
Science Media Centre
From March 2002 to December 2003, Peplow worked as a Science Information Officer at the Science Media Centre where he 'developed contacts with leading scientists and press officers in the UK, in order to promote scientists as contacts for journalists'.
From January 2004 to June 2006, Peplow worked for the science journal Nature where he reported on the physical sciences and science policy. He returned to the magazine in July 2008 for the role of News Editor before leaving to become a freelance science journalist in January 2013. 
- Mark Peplow (2013), About,accessed 18 September 2013
- Data from Internet Archive holdings of the Science Media Centre website, 2003, accessed 18 September 2013