Geefs studied under Van Geels and Jean-Etienne Ramey.
In 1833, he executed a colossal work at Brussels, "Victims of the Revolution," and numerous statues and busts as well as imaginative productions.
In his lifetime, Geefs work was marred greatly by what was considered frivolous and inessential details and poverty of thought, together with a perceived frigid coldness of expression in his modelling.
His two younger brothers (Joseph Geefs and Jean Geefs) were also distinguished sculptors; his wife Fanny was a noted painter.