[1] He was educated at Westminster School (1967–71) where his contemporaries included the journalist Tom Utley and Michael Zilkha, the co-founder of ZE Records.
[2] While at Westminster he was the lead guitarist in a band known as Jaded that was managed by the future British prime minister Tony Blair.
[3] Sieff was a freelance musician and producer until 1991 and then jazz manager at Tower Records until February 1995.
[5] In November 2012, he joined Gearbox Records where he was head of sales and marketing[6] until January 2017 since when he has been a consultant for them.
The company specialises in the release on vinyl of audiophile editions of previously unheard jazz recordings.