Marcus Sieff, Baron Sieff of Brimpton OBE (1913–2001), Jewish British businessman, chairman of Marks & Spencer from 1972 to 1982
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Adam Sieff, Communications Director at Dune Music, and a former Sony Music Director of Jazz
Sieff has worked with many bands and artists including Wasted Youth, The Bad Plus, Herbie Hancock, Alexis Korner, Hugh Masekela, Big Country, Angelique Kidjo, Wynton Marsalis, Branford Marsalis, Denys Baptiste, Jazz Jamaica, Albert Collins, Keb' Mo', Spitting Image, Edoardo Bennato, Matumbi, Peter White and Clare Teal.
On 30 December PFLP assassin Carlos the Jackal, Ilich Ramírez Sánchez called on Sieff's home on Queen's Grove in St John's Wood and ordered the maid to take him to Sieff.