camera:medium format ditatal back,100mm lens,on a tripod 6 feet back.
key light:2 small softbox(outer baffle removed to increase specularity)at f13,placed 3 feet to either side of subject and slightly behind it.
this placement creates the sharp highlights on his cheeks but also manages to fill hte front of his face.It also keeps away any reflection from his glasses.
2 white umbella at f5.6 are aimed at the seamless from the right and left sides to create a flat background.
the shadow behind subject's head is added in post.