Haussmann was in the royal Hessian service, as he was mentioned in a September 1717 letter of recommendation from Landgrave Ernst Ludwig of Hesse-Darmstadt as "Our court painter's son".
Haussmann estivo ao servicio real de Hesse, como se menciona en setembro de 1717 nunha carta de recomendación do Príncipe Ernst Ludwig de Hesse-Darmstadt como "noso fillo do pintor da corte".