Siân has been in the business since 1991. She has worked across many genres from editorial and commercial fashion, to live theatre, television and movies. She works as a Department Head/Designer and Personal Makeup Designer. Her range is vast and covers anything from fashion to prosthetics.

She's second generation makeup and started in London in fashion, editorial and commercials - and department headed her first movie aged 28 in the UK. She has worked globally in this position, or as personal makeup artist ever since.

Siân is best known for her work with Chadwick Boseman in his various roles, particularly as T'Challa in Marvel Studios Black Panther, Infinity Wars and Endgame, for his final role as Leve in Ma Rainey's Black Bottom, for her Emmy nominated makeup on Queen Latifah as Bessie Smith in HBO's Bessie and for her winning Critic's Choice Award for her five makeup transformations on Halle Berry in Cloud Atlas.
She now first call for LaKeith Stanfield, meeting him on critically acclaimed Judas And The Black Messiah, that she Department Headed in 2019; their first project as his Personal Makeup and Hair Designer is Book Of Clarence to be released January 2024 directed by Jeymes Samuel.
 
Siân comes from a diverse cultural background, represented by her citizenships. She is a British, US and Maltese citizen.
She lives in Los Angeles.