Patricia Wuillemin was born near Philadelphia in the United States. She attended Drexel University in Philadelphia where she completed a liberal arts program, receiving a Bachelor of Science degree. Following her graduation from Drexel University, she studied painting for four years at the Philadelphia College of Art where she received a Bachelor of Fine Arts degree in 1974.
Upon graduating from art college she continued to reside and paint in Philadelphia. She exhibited her oil paintings in various Philadelphia and New York galleries.
In 1989 she exhibited in the annual Small Works exhibition at New York University which was juried by Allan Frumkin of Frumkin Adams Gallery in New York; she won a juror award for her miniature oil painting. She also participated in the Small Works exhibition in 1990, juried by Ivan C. Karp of O.K. Harris Works of Art in New York.
After moving to Switzerland in 1992, the Swiss PTT selected one of her drawings to use as a telegram cover. She had various exhibitions in the Bern area and then in 1999 she participated in a two person exhibition at Leonardo Galerie d’art in Lausanne.
Her oil paintings have been exhibited in Geneva, Switzerland on different occasions: in 2002 at the Palais des Nations of the United Nations, in 2004 at the Villa le Chêne in the Botanical Garden and in 2005 in a group show at the Villa Dutoit.
From 2004 until 2007, she exhibited at the Galerie Bärtschi in Bern in group exhibitions and in solo exhibitions.
In April of 2011, she exhibited her paintings in the Contrast Kunstvitrine curated by Katharina Bütikofer in Bern.
In 2013, a two page color reproduction of one of her water lily paintings was included in the book, Victoria: The Seductress, by Dr. Tomasz Anisko, Curator of Plants at Longwood Gardens in the United States.
In 2018, she had a solo exhibition of her oil paintings at the Galerie Atelier Worb.
Since 2009 she has been a member of Visarte in Bern.
Her work is included in the web gallery www.contemporary-still-life.com .
Her Yellow Rose oil painting, 160x120 cm, is included in the Gemeindehaus Bläuacker art collection in Köniz. Her work is held in private collections in the Philadelphia area, in France and Switzerland, where she currently resides with her husband.