Anthony Steven
Anthony Steven (3rd August 1916-May 1990) wrote The Twin Dilemma.
He had a 30-year-career in writing for British television, which spanned from the late 1950s until 1989. Due to the widespread practice of wiping recordings done in the 1950s and 1960s, however, it's unclear how much of the first half of Steven's career survives in the 21st century.
Colin Baker's first story was actually one of Steven's last. In fact, a few episodes of All Creatures Great and Small are the only efforts which post-date Dilemma on Steven's resumé. Doctor Who fans who also watched All Creatures will likely remember one of his episodes as being particularly poignant. Steven's "Matters of Life and Death" was a 1980 episode that guest-starred Nicholas Courtney as a town resident profoundly affected by the inevitable death of his dog.
