Dear :

Recently, I have been offered a managerial position in [company]. Since the position will allow me to get more directly involved in , I have accepted the offer.

I would like to suggest, therefore, that I conclude my duties at [company] by [date]. If this would cause any inconvenience to the company, I am prepared to work together with you on a more appropriate date.

My work at [company] has been a rewarding experience for me. I am especially grateful for the support you gave me at every important juncture in my career during the past years. Leaving the company was a difficult decision for me and I wish you and other colleagues only the best for the future.

Sincerely yours,

[name]

[title]