Grosso was born on 1 April 1983 in San Martín, a city in the Greater Buenos Aires conurbation.

[2] Grosso was first elected to the Chamber of Deputies in 2011 in the Front for Victory list in Buenos Aires Province, in which he was the 20th candidate.

[3] He was elected and sat in the Front for Victory bloc, aligned with the government of then-president Cristina Fernández de Kirchner.

[5] Ahead of the 2017 legislative election, Grosso and the rest of the Evita Movement broke ranks with the FPV and instead backed the unsuccessful senatorial candidacy of former Interior Minister Florencio Randazzo; in the Chamber of Deputies, the Evita Movement formed the Peronism for Victory bloc, which later formed part of the Red por Argentina parliamentary group alongside, among others, deputies Felipe Solá and Victoria Donda.

[12] Grosso is a vocal supporter of the legalization of abortion in Argentina, and voted in favor of the Voluntary Interruption of Pregnancy Bill during its treatment by the Chamber of Deputies in 2018 and 2020.