It's the second wedding for the 69-year-old Lucas, who was married to film editor Marcia Lucas from 1969 to 1983.
It's the first marriage for Hobson, 44, an investment firm president and contributor to ABC's "Good Morning America." The two have dated since 2006. Former U.S. Sen. Bill Bradley walked her down the aisle.
The Saturday afternoon ceremony was performed by journalist Bill Moyers, who was once a Baptist minister.
Guests included filmmakers Steven Spielberg and Ron Howard, who said on Twitter that the wedding was "a joy to behold" and Moyers' service "nothing short of profound."