We used Megan DiNicola and were extremely impressed with her design style and knowledge. Our porch addition looks like it was always part of the house.
her email is megan.nash @ gmail dot com.

Have not used them but Kramer Architects seems to be a popular architect in Bethesda.

Wait, completely out of place two-story pop-ups are nicer than re-imagining contemporary? I personally dislike contemporary design, but I absolutely HATE the gnarly ranch pop-ups that appear all the time these days, especially when the second floor is done with cheap vinyl versus first floor brick.