 His documentaries include "Amor en tiempos de influenza" (Love in the times of influenza) and "La rebeldia bajo sitio" (Rebellion under siege), as well as features for Democracy Now!.Berger often uses the persona "Gringoyo", a "tragicomic character to talk about social issues" that concern him, and utilizes street-theater and humor, drawing comparisons to Michael Moore.His film "Love in the times of influenza" focusses on the H1N1 crisis, and the role Smithfield Foods allegedly played in its outbreak.