Steve Baker: Defender, Stargate
Steve Baker is well-known in the Atari world as having done the 400/800 and 5200 conversions of Defender.  He also did ports of Stargate for the 5200 and the 400/800.  Additionally, he developed Miniature Golf and Microgammon SB for the 400/800 and 5200, and Reversi and Gomuku for the 400/800.   He worked for Apple from 1980 to 1982, then for Atari from 82 to 84.  Steve also wrote games for the Apple II, the Atari 2600, the Intellivision, and the Commodore 64.
This interview took place on November 1, 2015.
Links:
Interview with 2600 Connection - http://www.2600connection.com/interviews/steve_baker/interview_steve_baker.html
Defender video at YouTube - https://www.youtube.com/watch?v=MiB_DttmN3Y
Defender at AtariMania - http://www.atarimania.com/game-atari-400-800-xl-xe-defender_1561.html
Stargate for the 400/800 Video (YouTube) - https://www.youtube.com/watch?v=vI1iILhB9Dg