Carl Justus Heyer

Carl Justus Heyer (April 9, 1797 – August 24, 1856) was a German forester and professor of forestry at the University of Giessen.

Heyer was born in Bessungen to forester Jacob Wilhelm (1759–1815) and Louise née Walloth (1770–1805).

His father died in 1815 and he was fortunate in receiving a scholarship from the Grand Duke Ludwig I.

He studied forest cameralism from professor Friedrich Ludwig Walther (1759–1824) and in 1817 he attended classes of Heinrich Cotta.

He left forestry service in 1843 due to lung disease and began to work on writing and teaching alone.