She attended South Hampstead High School before graduating with first-class honours in Music in 1996 from the University of Oxford.
While there, she directed and produced short films and presented a weekly live arts show on the student radio station Oxygen FM. She gained a postgraduate diploma in broadcast journalism from City University London. After winning the William Hardcastle Award for Journalism, Klein began her professional broadcasting career as a presenter on the Canadian Corporation"s radio and television services. She returned to the United Kingdom to work for the British Broadcasting Corporation as an assistant producer at Radio 4 on programmes including Start the Week and Loose Ends.
She then moved to British Broadcasting Corporation Television, working as a director and producer on a range of arts and music films.
Klein became a presenter in 2005, when she was listed in "The Guardian"s "25 up-and-coming cultural figures". In 2008, she presented The Proms season on BBC2.
She has also presented the BBC2 programmes The Culture Show, British Broadcasting Corporation Young Musician of the Year and The Review Show. Klein currently hosts Radio 3"s drivetime show, In Tune, alongside concerts and events.
She has been one of the lead voices on the station"s major campaigns of recent years, including its celebrations of the complete works of Mozart and Schubert.
In 2011, Klein presented the first ever live opera in 3D, hosting the Director"s Cut with Mike Figgis - a live, 3 hour discussion with the director about his new production of Lucrezia Borgia. Foreign Sky Arts, Klein hosted the flagship performance programme, Greats at Eight, weekday evenings on Sky Arts 2. She also presented Aida from the Royal Albert Hall (March 2012) for the broadcaster and The Rosenblatt Recitals in summer 2013.
In 2013 she was named Music Broadcaster of the Year, winning the Silver Prize at the Sony Awards.
She currently co-presents Saturday Live on British Broadcasting Corporation Radio 4 and has made a documentary for the station about fear and phobias. She has presented global opera broadcasts for the Royal Opera, London, and hosts of all of the global cinema broadcasts of the Royal Shakespeare Company, including 3 live shows for 2014.
In April 2014 she presented the British Broadcasting Corporation Four television documentary series Rule Britannia! Music, Mischief and Morals in the 18th Century Voiceover Klein has done a broad range of voiceover work, from BBC1 primetime documentaries on Pink Floyd and The Carpenters to a three-part series on Brazil, and an Arts television series for British Broadcasting Corporation Four. Klein is a patron of Scale Vocal Trust, a charity which helps talented young singers realise their potential and get into music college.
Klein is married with two children and lives in Shepherd"s Bush, London.