Rubuta ci gaba don wannan sakin layi - Lokacin da yake matashi, Humphreys ya zama mai koyon sana'a ga mai gina jirgi a Philadelphia, Pennsylvania. A lokacin da yake karatun, malamin sa ya mutu kuma an sanya shi a matsayin mai kula da ma'aikata. A lokacin Yakin Juyin Juya Halin Amurka ya kasance mai aiki a matsayin mai tsarawa, kuma ya taka muhimmiyar rawa wajen tsara jirgin ruwa na 32-gun kafin sojojin Birtaniya
mamayewar Philadelphia ta dakatar da wannan kokarin.