He then became a member of the school committee in 1871 , holding that post until 1873 .
Greenhalge served on Lowell 's common council in 1868 and 1869 .
Greenhalge then became a member of the school committee in 1871 , holding that post until 1873 .
Greenhalge served on Lowell 's common council in 1868 and 1869 .