Hann was educated at the state girls' school Parkfield Cedars Grammar School in Derby, followed by the University of Durham in Durham, from which she graduated with a BSc Degree in Zoology.

Hann presented BBC's Tomorrow's World on BBC1 between 1974 and 1994. She has since made guest appearances on various TV shows, and has done some TV commercials. Recently she appeared in a Shredded Wheat advertisement in which she used her scientific judgement to inform viewers that the product could possibly help keep their hearts healthy.She recently presented a programme on BBC Radio 4, "Two's A Crowd".

Currently she runs her own successful media training and presentation skills company - Media Advantage - with her husband John Exelby.

Judith Hann lives on a farm near a small town called Lechlade, in the Cotswolds. She is married to John Exelby, a former executive at BBC News, and has two sons; Jake and Daniel Exelby. She is passionate about herbs and has a very large garden.

• Tomorrow's World (BBC1) Presenter (1974—1994) (she was its longest serving presenter.)
• The Risk Business (BBC1) - Presenter (1980)
• Not with a Bang (ITV) - as herself (1990)
• Shooting Stars with Vic Reeves and Bob Mortimer (BBC2) - Episode #3.7 (1997) as herself.

She is the daughter of former Derby County footballer and trainer Ralph Hann.