An important and yet subtle member today of what informally may be considered the second row of French Impressionists, the marks that Antoine Guillemet set with his artistic output are prodigious and will continue to make inroads into collections over the years to come. He was a huge success in his lifetime within the salons of Paris. Those accomplishments contribute to why today with the world's "discovery" of the Impressionists, other Barbizon and Plein-Air painters have yet to receive the full acclaim they rightly deserve.

Early on, after being commissioned to copy museum works, Guillemet met Jean-Baptiste-Camille Corot. The two would be close for the rest of their careers, with Guillemet calling Corot "Papa". Through his acquaint...