Mozart's physical appearance was described by tenor Michael Kelly in his "Reminiscences": "a remarkably small man, very thin and pale, with a profusion of fine, fair hair of which he was rather vain". His early biographer Niemetschek wrote, "there was nothing special about physique... He was small and his countenance, except for his large intense eyes, gave no signs of his genius." His facial complexion was pitted, a reminder of his childhood case of smallpox. He loved elegant clothing. Kelly remembered him at a rehearsal: was on the stage with his crimson pelisse and gold-laced cocked hat, giving the time of the music to the orchestra." Based on pictures that researchers were able to find of Mozart, he seemed to wear a white wig for most of his formal occasions—researchers of the Salzburg Mozarteum declared that only one of his fourteen portraits they had found showed him without his wig. Of his voice, his wife later wrote that it "was a tenor, rather soft in speaking and delicate in singing, but when anything excited him, or it became necessary to exert it, it was both powerful and energetic."