I left my old job to better myself and I have my old supervisor to thank for that and for influencing me to branch out. 
I got a new job and it is so great and I have my old supervisor to thank she's the best.
user
Why you need to thank her? Is she the one that helped you to find the new job?
assistant
She was a great influence and gave me words of encouragement to branch out and go for more then our company job.
user
She is very nice person. That is great.
assistant