My great-grandfather on my mother's side, father of Richard Dennis Armstrong, my grandfather on my mother's side. My brother Brian's middle name is Dennis, in remembrance of this man.
I don't think I've ever seen this picture before. I never met him and don't know anything about him, although there may be some more information with my grandmother's papers. This photo needs some restoration work; it is covered with scratches that make him look like he has stray white hairs all over his face.
UPDATE: Linda reminded me that Dennis is also the middle name of Joan Joy (Armstrong).