Conversation so far:
what was the colorado rockies about?
Looking for a veteran bat to help their playoff push, the Rockies agreed to a deal with Giambi on August 23, 2009.
was Looking for a veteran bat to help their playoff push, the Rockies agreed to a deal with Giambi on August 23, 2009. successful?
On May 19, 2011, Jason Giambi hit three home runs in one game, the first such game for him of his career.
who did Jason giambi play against when he hit three homeruns in one day?
The Philadelphia Phillies
what were Jason Giambi's stats during his time period with the colorado rockies?
anything else about Jason Giambi's time period with the Colorado Rockies I should know about?
Giambi became a free agent after the 2012 season and was a finalist for the Rockies major league managerial opening, which eventually went to Walt Weiss

Question: who were his clients?
Self-contained rewrite: who were Jason Giambi's clients?