Harriet began playing at the age of three, performing publicly a year later. At the age of five, Harriet won a full scholarship from the Elsie & Leonard Cross Memorial Foundation to the Guildhall School of Music studying under the late Professor Emeritus, Jimmy Gibb. At the age of seven, Harriet had completed Grade Eight with distinction.

Invited to play at the Blackheath International Piano Festival at the age of eight, Harriet's "Exceptional musicianship, poise and supreme confidence" was critically acclaimed. Harriet went on to give solo  recitals all over the UK including the Del a War Pavillion, Canterbury Theatre, Brighton Festival, Castle Howard and St Martin-In-The-Fields. Performances of Mozart's piano concerto K414 and the Bach D minor with the Primavera Chamber Ensemble at The Rye Festival Winter Series received further recognition, leading to an hour long interview on BBC World Service, BBC Radio York and BBC Southern Counties. 

 Voted one of the top three pianists in Britain by Julian Lloyd Webber on ITV"s "Britain's Brilliant Prodigies", Harriet then went on to play in "Harry Potter And The Prisoner of Azkaban". In the UK Harriet studied her undergraduate degree with Douglas Finch and  was performing at St John's Smith Square, St John's Waterloo, Cheltenham Recital Series, The Reform Club, St. James's Piccadilly, The Georgian Theatre Royal, London City Lights Festival, for the Rt Hon Lord Mayor of London and Sheriffs for the 800th Anniversary Awards Trust and for the Ambassador of the United States of America for the Association of American Study Abroad Programmes in the UK. Harriet also had the pleasure of working on BBC Maestro with Katie Derham, Radio 1 DJ Goldie and Blur bassist Alex James. 

In Europe Harriet performed in Perugia (with Angela Hewitt), Valencia Spain and Cyprus for the Prime Minister on National Television.

In the US Harriet has had an extensive solo performing career and is a voting member of the New York Chapter of the Recording Academy, an artist for the TJ Martell Foundation, performing at Tibet House, Stephen’s Talkhouse, Arlene’s Grocery and Carnegie Hall. Harriet’s debut album Heaven And Hell: The Doors Of Perception, released by Naxos Of America and produced by multi Grammy award winning producer Russ Titelman features Marianne Faithfull and is based on William Blake’s concept of the doors of perception. Featured on KGO in San Francisco, WFUV, WQXR Radio. Harriet’s East Coast Launch was at Le Poisson Rouge NYC and West Coast at Blue Whale LA as well as LACMA (Los Angeles County Museum of Arts) live on MixLR and broadcast on Southern Californian radio station KUSC presented by Yamaha Artist Services New York.

During the Covid 19 lockdown Harriet gave 250 daily concerts in London’s W8 covered most recently by The Evening Standard, Good Morning America, ABC News and BBC Culture. Harriet has been awarded a British Empire Medal by Her late Majesty Queen Elizabeth II in recognition of her concert series and service to the country in the Queens’s Honours List 2022. Harriet has been named Musical America’s Top 30 Professionals In the Arts for their Resilient Warriors Special of 2022 and has a podcast documenting this time: The PIano With Harriet Stubbs with guests including WNYC’s Paul Cavalconte and American philosopher Dr Cornel West.

Harriet’s latest album Living On Mars, produced by Mike Garson of David Bowie’s Aladdin Sane with repertoire from Bach to Nick Cave & The Bad Seeds was released on Sony Music Entertainment’s The Orchard and reached close to half a million streams in it’s first week of release. Performed most recently at LPR, London’sJazz Cafe Pizza Express, The Cutting Room, Joe’s Pub and City Winery.