After his first trip to the United States, Ishtay three boutiques in Venezuela, which were later lost due to the country's political and economic crisis. Afterwards, he permanently moved to Los Angeles, US.[4]
Ishtay studied pattern making and sewing privately and also made a living driving Uber.[5] In 2016, he did an internship at Los Angeles Fashion Week. At the Autism Speaks event, Ishtay designed a dress for American rapper, singer, and actress Eve. Following the event, Ishtay donated her dress to charity.[3]
Ishtay has dressed various actresses, singers, and models, including Tyra Banks,[6] Carrie Underwood, Anitta, Thalia, Chiquis Rivera, Jeannie Mai, Paulina Rubio, Lauren Jauregui, Ariadna Gutiérrez,[7] and Nikita Dragun.[3] Lauren London chose a white, form-fitting design from Ishtay's collection for the 2019 Grammy Awards, while Gaby Espino wore one of his dresses for the Billboard Latin Music Awards in 2020.[8]
Earlier in 2022, the designer dressed rapper Icy Bae (Saweetie) for the latest campaign for firm MAC Cosmetics, in which she starred alongside Cher.[9] Also, in March 2022, he presented his collection at Los Angeles Fashion Week.[10][11][12]