Good morning and welcome from South Florida and the Reenactors forum. I don't know who that is but it's quite a flavor savor he's sporting. I'm sure someone here can ID him.
Love the beard. I hate shaving and have a beard nearly my entire adult life and never let it get grow past the first or second button on my shirt (from the collar). This picture would look great colorized.
I figure it's a higher ranking (Union) officer, perhaps a Brigadier general (?) due to the fancy epaulettes and the longer beard, but I just can't match the face or beard to anyone
Albert Jenkins had an epic beard, but he was Confederate...McAllister had a long beard too, but he had a much thinner hairline than the pictured officer
Welcome From The Heart Of Dixie. Be sure to stop by the Weapons & Ammo and Uniforms & Relics forums. Below is a link that may help you with your search.