Jonas Grassi is from Argentina. He began his studies at the school Polivalente de Arte in the city of Mar del Plata, Argentina, then at the Instituto Superior de Arte del Teatro Colón in Buenos Aires where he graduated from Ballet, dancing as an apprentice in the ballets La Sylphide, El Corsaire, Nutcracker, among others. He also studied at the Taller de Danza Contemporanea del Teatro San Martin, obtaining the Ana Itelman scholarship in 2017. He danced with the Ballet Metropolitano of the city of Buenos Aires and the company of David Señoran and apprenticed with Teatro Argentino de La Plata.
In 2018, he did the Summer Dance Intensive with Arts Umbrella in Vancouver and is currently dancing with the Performance Research Project under the direction of Lesley Telford.