In this Haarlem artist's most famous piece, a mustachioed man in flamboyant attire is shown smiling, but not actually riding a horse.
This artist's biographer Arnold Houbraken claimed that this artist's professional difficulties were mostly due to a drinking problem. Until 1893, the entirety of Judith Leyster's works were attributed to this artist, who showed an infant in an extravagant gold dress in Catharina Hooft with Her Nurse. A banquet full of armed men from a group called "St. Adrian" look at the viewer at in one this artist's many paintings of (*) militia companies. This painter depicted a laughing woman with an owl on her left shoulder in Malle Babbe. In this Haarlem artist's most famous piece, a mustachioed man in flamboyant attire is shown smiling, but not actually riding a horse. For 10 points, name this Dutch Golden Age portraitist of The Laughing Cavalier. 
This artist's biographer Arnold Houbraken claimed that this artist's professional difficulties were mostly due to a drinking problem.
Frans Hals (the Elder) 