Listed in the Dublin Directories as 'French horn maker' and by Teahan and Waterhouse as a 'French horn, bugle horn and trumpet maker'.

Worked in partnership with Matthew Pace as 'Clarke & Pace' from c. 1781 to 1798 (Waterhouse).

Succeeded in business by Matthew Pace in 1798 (Waterhouse) at 23 Henry Street (Dublin Directories and Teahan).

[Details differ according to sources: the Dublin Directories give Henry Street between 1770 and 1774 and 23 Henry Street between 1775 and 1796; thereafter he is not listed until the isolated entry in 1796. Doyle (citing the Dublin Directories) gives Clarke Esaw [sic] at Henry Street in 1770. Teahan gives Henry Street from 1767 to 1774 and 23 Henry Street from 1775 to 1788. Waterhouse gives Henry Street from 1767 to 1765 and 23 Henry Street from 1775 to 1796. Bacon (citing Wilson's Dublin Directories gives 23 Henry Street from 1774 to 1788.]