He studied first piano at the Conservatoire in his birth city of Ghent. At the Royal Scottish Academy and the London Guildhall School of Music and Drama he specialised in singing accompaniment. He was also holder of the Geoffrey Parsons Junior fellowship at the Royal College of Music.
In the Royal Opera House La Monnaie in Brussels he assisted Antonio Pappano and Renato Balsadonna and worked in productions with singers such as Susan Graham, José van Dam, Jonas Kaufmann and Joseph Calleja. He has also played for conductors such as Kazushi Ono and Alessandro de Marchi. In addition to this, he has worked with singers for the Filharmonie, the Flemish Radio Choir, the Flemish Opera, Covent Garden, the Queen Elisabeth Music Chapel and the Collegium Vocale, Gent.
Hein has always had a special affinity with the song repertoire. In song recitals he has played in Europe, Asia and Australia. He accompanied Jonathan Lemalu and Sandra Martinovic at the Wigmore Hall in London and played live for them on BBC Radio 3. In the Palais des Beaux-arts in Brussels he accompanied soprano Sophie Karthäuser in a tribute to José Van Dam. With Howard Wong he played series of concerts around the poet William Blake, and many English composers, performed in Belgium and the UK. This resulted in the well acclaimed cd "Gerald Finzi: A Song outlasts a dynasty". Furthermore he has worked with singers such as Malin Christensson, Laura Mitchell, Nathan Vale, Thomas Blondelle, Christian Immler, Julie Mossay, Rachel Harland and many others.
In 2006 he started the ‘Vocal Journey’ recital series, for which he devised and played concerts with young singers from all over the world.
He was coach and pianist for singing courses in the UK, Malaysia, Singapore, Thailand, Portugal and France, for which he was often also musical director for staged productions.
He was official accompanist for vocal master classes by Sir Thomas Allen, Robin Bowman, Emma Kirkby, Ann Murray, Loh Siew-Tuan, Graham Johnson and Dame Margaret Price.