From Wikipedia, the free encyclopedia Robert F. Logan, Jr. (born May 29, 1941) was an American actor who appeared in numerous films and television programs, the most notable of which were a very successful series of family adventure movies in the 1970s. Born in Brooklyn, New York, Logan was the eldest of seven children born to bank executive Robert Senior. Young "R.J." was active in high school sports; he received a baseball scholarship to the University of Arizona at Tucson. There he was spot...