Answer: Bruce Chen
Bruce Chen began his MLB career with the Atlanta Braves in 1998 at the age of 21. He only appeared in two games that season but was also with Atlanta through 2000.
In the year 2000, Chen joined the divsion rival Philadelphia Phillies. This was certianly not the only time Chen bounced to another organization. Over his 17 year career, he played for 11 different teams.
Chen's career was a mix of starts and relief appearances in which he posted a 82-81 W/L record with a 4.62 ERA and a 2.09 career strikeout to walk ratio.
Since his career was so long and let's face it, not outstanding, Chen is not remembered as an Atlanta Brave at all.