While she had no formal make-up training, her career breakthrough came while working on i-D magazine in the early Nineties. Since then she has worked with all the world's top fashion photographers, designers and models.
During the Nineties she spent ten seasons creating the make-up concepts for Prada and Miu Miu and in 1999 was asked by Giorgio Armani to design his cosmetics line.
In 2004 she was named global cosmetics creative design director for Procter&Gamble, the name behind make-up brands including Max Factor, Dolce&Gabbana, CoverGirl and SK-II.
She regularly collaborates on major fashion advertising campaigns such as Louis Vuitton, Prada, Lanvin, Calvin Klein and Balenciaga, and her editorial work includes regular shoots with Vogue Italia and American Vogue.
In a Vogue article in 2007 she was named the most influential make-up artist in the world and has worked with celebrities as diverse as Madonna, Sarah Jessica Parker, Cate Blanchett and Oprah Winfrey.
Despite creating the make-up for a plethora of shows and campaigns each season, McGrath remains inspired, telling VOGUE.COM in 2008: "I'm influenced a lot by the fabrics I see, the colours that are in the collections and the girl's faces. It's always a challenge but that's the key - to make it different every time."
Her best runway work 2003 - 2006
John Galliano S/S 03
Dior Haute Couture F/W 03/04
Dior Haute Couture S/S 04 & Gucci F/W 03/04
Dior Haute Couture F/W 04/05
John Galliano F/W 05/06 & Gucci F/W 05/06
Gucci S/S 06 & Viktor&Rolf S/S 06
Valentino F/W 06/07 & Viktor&Rolf F/W 06/07
Gucci F/W 06/07 & Rochas F/W 06/07