A fairly simple situation, just looking for pointers.
My organization is fairly large but flat - have two managers who focus on career development of their appropriate direct reports (plus resolve project priority/chase funding/etc.).
Both managers are fine professionals and I generally have no personal preference. My manager (A) is more aggressive and wants to grow. The second manager (B) is more laid back and balanced.
Over the past year, I have developed a nice relationship my manager (A). He pushed through my promotion and a nice training package.
I have been recently reassigned to the other manager - as part of a simple head-count balancing act. The reassignment was based on technical skillset - the idea was to have members with similar skills report to the same manager.
I have found out that there has been some back and forth between the two managers over me. There have been some mixed messages from both (A - you still report to me. B - it is clear that you report to me, right?)
The general manager (manager of managers A/B) has scheduled a meeting with me.
I think I should stay impartial - that is, it does not seem to be prudent to play favorites and take sides by favoring one manager over another - but would like to show some gratefulness to manager A as well (promotion, training). What would be the best way to convey this message to the GM?