Johann Heinrich Gelzer 1813–1889 Source: Wikimedia Commons About Johann Heinrich Gelzer Swiss historian (1813-1889) People from the Same Era Charles Harpur 1813–1868 poet, writer Windsor Edward Flood 1805–1888 carpenter, company director, land owner, magistrate, master builder, merchant, miller, pastoralist, politician, ship-owner Sydney Ludwig Schwarz 1822–1894 astronomer, explorer, geographer Gdańsk Georges Krenger 1816–1877 composer, organist Guebwiller Mahlon Dickerson Manson 1820–1895 military officer, politician Piqua Freeman Clarke 1809–1887 politician Troy