Griffith became Commissioner of Valuation and Ganly worked under him in his role as a valuator. From 1846–9 during the great famine years, Ganly was engaged in famine relief under the auspices of the Board of Works, of which Griffith had become chairman. He returned to valuation work in 1853, by which time he had married Mary Elizabeth (Eliza) [maiden name unknown]. He was made redundant from valuation work in 1860. It has been suggested that he may have worked in the US in the early 1850s and worked as a civil engineer in Ireland after 1860.