Pierre has designed fashions for four United States first ladies since the 1990s: Hillary Clinton, Laura Bush, Michelle Obama, and Melania Trump.
[3] In the beginning of the 1990s,[4] he moved to the United States where he worked for Oscar De la Renta .
After Bill Blass he worked for Carolina Herrera for 14 years, where he left a position as creative director in February 2016.
[6] His clients have included US first ladies Hillary Clinton,[7] Laura Bush[7][8] and Michelle Obama.
[10][7] In 2017, Pierre collaborated with her to design her gown for the Donald Trump inaugural balls.