In 2019 in remplacement of Constance Ronzatti, Leo Marillier toured Colombia, Europe and the U.A.E., as a temporary member of the DIOTIMA Quartet, giving premières, a Bartok cycle, as well as works by Schubert, Beethoven, Berg. He performed in venues such as the Hamburg ElbPhilharmonie, Cologne Philharmonie, Louvre Abu Dhabi, Auditorium de Radio-France, Chicago, Los Angeles, Dallas...
Léo assumes now full time membership as the second violin in the DIOTIMA Quartet in 2022.
