 Hammerstein took the singer in hand and put him under the tutelage of voice teacher Oscar Saenger; paying for the singing lessons himself.Harrold later pursued further studies in Paris in 1912–13.In 1910 Harrold joined the roster of singers at both Hammerstein's Manhattan Opera House and Hammerstein's Philadelphia Opera Company; making his debut with both companies in the Spring of 2010 as Canio in Ruggero Leoncavallo's "Pagliacci" with Mario Sammarco as Tonio and Giuseppe Sturani conducting.