He is a master perfumer at Swiss fragrance and flavor firm dsm-firmenich, where his notable creations have included Calvin Klein CK One, Giorgio Armani Acqua di Giò and Marc Jacobs Daisy.

[2] He cites as early scent memories his mother's bottle of Rochas Femme and his father's hair tonic.

[3] Mainly self-taught,[4] Morillas began working in perfumery at 20,[3] inspired by a Vogue article about French perfumer Jean-Paul Guerlain.

[4] Among Morillas's notable creations is CK One, developed with Harry Fremont in 1994 for Calvin Klein fashion brand.

[6] In Perfumes: The Guide, Luca Turin gave CK One four of five stars, describing it as a "radiant citrus" that combines "soapy, fresh top notes" with heart and base notes simultaneously, creating a linear effect in which the scent sustains one "chord" rather than shapeshifting over the course of the day: "Time forever stands still at 8 a.m.: the frozen morning of a day full of promise.