One of the best and most profilic of them is Bob Hornung of Cincinnati, who designs, sculpts, casts, and paints all his own figures. I got my first Hornung knight back in 1996, when I first started collecting toy soldiers, and I have been adding more ever since.
Here are just a few examples of Bob's work. Sir John Cheyne crosses swords with Sir Alan Boxhulle in one dramatic pairing. In the other we see Sir Walter Gloucester about to mount up for battle.