• 
  Samuel West

   Narrator (19 episodes, 2002-2006)
• 
  John House

  Self - The Courtauld Institute, London
• 
  Tamar Garb

  Self
• 
  Christopher Riopelle

  Self
• 
  Douglas Druick

  Self
• 
  Martin Kemp

  Self - Author, Leonardo
• 
  Timothy Verdon

  Self - Canon, Florence Cathedral
• 
  Luke Syson

  Self - National Gallery, London

• 
  Camille Paglia

  Self - University of the Arts, Philadelphia
• 
  Marcus Burke

  Self - Hispanic Society of America
• 
  Philippa Abrahams

  Self - Artist and Conservator
• 
  Waldemar Januzczak

  Self - Art Critic
• 
  Taco Dibbits

  Self - Curator, Rijksmuseum
• 
  Juliet Wilson-Bareau

  Self - Art Historian
• 
  Gloria Groom

  Self - Art Institute of Chicago

• 
  Charles Nicholl

  Self - Author, 'Leonardo Da Vinci: The Flights of the Mind'
• 
  Jonathan Jones

  Self - Art Critic, The Guardian
• 
  Richard Cork

  Self - Art Critic