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.

Harriet now divides her time between New York City, Los Angeles, and London. Harriet is a voting member of the New York Chapter of the Recording Academy and an artist for the TJ Martell Foundation. Performing most recently in New York for Cynthia Nixon at her fundraiser to become Governor of NYC, Carnegie Hall, Carriage House Studios, Silver Lining Lounge, The Cutting Room,  and at 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. Harriet was also featured on KGO Radio in San Francisco, WFUV, WQXR and WPKN Radio. Harriet’s East Coast Launch was at Le Poisson Rouge NYC and West Coast at Blue Whale LA in support of her first commercial album release distributed by Naxos, produced by multi Grammy award winning producer Russ Titelman and featuring Marianne Faithfull based on the concept of the doors of perception.

During the Covid 19 lockdown Harriet gave 250 daily concerts in London’s W8 covered most recently by The Evening Standard,  WQXR NYC, WFUV, Good Morning America, ABC News and BBC Culture. Harriet has  been awarded a British Empire Medal by Her Majesty The Queen in recognition of her concert series and service to the country in the Queens’s Honours List 2022 and as well as being named Musical America’s Top 30 Professionals In the Arts for their Resilient Warriors Special of 2022. Harriet’s podcast The PIano With Harriet Stubbs features guests from WNYC’s Paul Cavalconte to Presidential Candidate Dr Cornel West.

Harriet’s brand new album, produced by Mike Garson of Aladdin Sane with repertoire from Bach to Nick Cave & The Bad Seeds has just been released on Sony Music Entertainment’s The Orchard on October 13th 2023: Living On Mars has reached close to half a million streams and been performed at Arlene’s Grocery NYC, Tibet House NYC, Salmagundi Club and Stephen Talkhouse in The Hamptons, Le Poisson Rouge NYC, London’s Jazz Cafe Pizza Express Live, and Joe’s Pub NYC June 2024. Harriet is a 2024 fellow of the British American Project and is now preparing to tour Living On Mars in Australia, Japan, and the US including City Winery NYC January 21st 2025.