Philip Treacy le Bon, Kate Moss, Christy Turlington and Stella Tennant modelling in return for keeping Treacy's hats, which were all black. In 1994, he opened up his boutique at 69 Elizabeth Street, in Belgravia, London, right beside Isabella Blow's resicence at number 67. Treacy has designed hats for Alexander McQueen (another discovery of Isabella Blow), including his 1999 "white collection" for Givenchy Haute Couture in Paris, for Karl Lagerfeld at Chanel, and for Valentino, Ralph Lauren, Donna Karan, Versace and Rifat Özbek. In January 2000, he became the first milliner for 80 years to be invited to exhibit at the Paris
Patrick Treacy for the Michael Jackson Legacy foundation, and in 2012 opened Everland Children's Orphanage in Liberia and orphanages in Haiti in 2013. The Sun newspaper reported that Treacy was due to treat Jackson shortly before the singer's death in 2009. In 2009, Treacy was on the special witness list for the trial of Conrad Murray, however, he was not called to testify. He released a memoir entitled "Behind the Mask (memoir): The Extraordinary Story of the Irishman who became Michael Jackson's Doctor" in 2015. The 1987 needlestick incident eventually led to Treacy's humanitarian work in Africa and his developing an empathy