There are actually more than three. I find Andrew's work too trendy and too monochromatic for my taste (how many sepia/dull gold/off white still lifes or static portraits with the subject huddled down in one corner of the painting do we really need?), although he does occasionally hit one out of the park -- like this one:
Jamie is a mordant portraitist - check out this all-too-revealing take on Andy Warhol:
But I am partial to Carolyn Wyeth, although it's hard finding her work. American Heritage magazine did an article on the Wyeth clan that featured several of her paintings, and they are arresting (and strange).
I think Winslow Homer may be my favorite American painter, though.
I am pretty partial to "Right and Left" by Homer, an oil painting, I believe.
Way in the background, under the wing of the duck on the left, you can see the guy in the boat firing his shotgun toward the ducks (and the viewer).