Oh, sure, there’s Thomas Jefferson and his Monticello estate. Some of the more informed could probably cite Frederick Law Olmsted. He designed New York’s Central Park (among other famous outdoor spaces) and is considered by many to be the father of American landscape architecture.
The even more informed could probably name Andrew Jackson Downing, who is another contender for papa bear of the profession.
But beyond those men—all of whom died more than a century ago—the pickings are slim. (My apologies to Hideo Sasaki.)