Dear,
Leonardo
I hope this email finds you doing well. I am writing because I don't think I ever properly thanked you for the amazing work you did for me to help me finish my dissertation. I am truly thankful. I will be able to help many veterans and their families with the wellness clinic I will be opening in the summer.
I would have sent a thank you card but it just didn't seem like it was enough. It hasn't come to me yet of what I can do, but I will do something special for you besides referrals.
You were a blessing to me and I thank you!
Brian