(Incidentally, Alexander Graham Bell's father, Alexander Melville Bell, was a phonetician.) During World War II, work at the Bell Telephone Laboratories (which invented the spectrograph) greatly facilitated the systematic study of the spectral properties of periodic and aperiodic speech sounds, vocal tract resonances and vowel formants, voice quality, prosody, etc.
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In the States he studied with Lewis B. Monroe, Alexander Melville Bell, and Steele MacKaye; he also spent two summers in Europe studying with Emil Behnke, Lennox Brown, Francesco Lamperti, and the famed François Joseph-Pierre Regnier, head of France's National School of Acting.