In late 1984, Gessinger formed a rock band besides two friends from architecture college at UFRGS, Carlos Maltz and Marcelo Pitz, to play in a parade made by students.

Engenheiros do Hawaii reunited in 1997 with the trio's formation (Humberto playing bass, Luciano Granja on guitar and Adal Fonseca on drums).

He recorded music alongside musician friends from Rio Grande do Sul and former Engenheiros do Hawaii members.

[3] Since then, he has released two LP's, Pra Ficar Legal(2016), and Desde Aquela Noite(2017), both serving as celebration for his 30 years of his first two albums, respectively, and as basis for the following tours.

This resulted in musical partnerships: Gessinger recorded a song along Maltz in the latter's solo album (Farinha do Mesmo Saco, 2001) and the Folia de Reis EP in 2017; and Maltz made a cameo on Engenheiros do Hawaii's MTV Unplugged (2004), Novos Horizontes (2007) and the to-be released Desde Aquele Dia DVD tour (2018).