The chief spoke about how City have seen several of their staff members poached.
Omar Berrada has gone to work as the CEO of Manchester United, while former academy director Jason Wilcox has also gone to United via Southampton.
“Frankly, (it makes me feel) proud,” said Al Mubarak to club media.
“It tells you we are very good at what we do at every level.
“When you see, and I use the word graduates, players at the academy level, players at the first team level leave and go and have successful careers. Coaching staff, medical staff, physios, senior executives that are being sought after by the best teams in the world.
“I think if anything, that's testament that we're on the right track. It confirms a) that we're doing it right, b) the people, c) that we have a system, that we have great leadership, that we have great management and a system that continues to produce talent at every level.
“Every aspect of the business of football, from coaching to playing to managing. When you look at people that get an offer for a great job at another club, of course you understand.
“It’s natural people will take other challenges. But I think one thing that I will hopefully always feel is that when they leave, they leave with appreciation for the time they spent at the club."