ex-boss (n)

My ex-boss gave me a great reference.
Working with my ex-boss was a challenging but ultimately valuable experience for my professional development.
I recently had a chance encounter with my ex-boss at a networking event, and it was surprisingly pleasant.
Despite the differences we had, I learned a lot from my ex-boss about leadership and project management.
Leaving my previous job and my ex-boss behind opened up new opportunities for me to explore in my career.