We often have questions in this forum about knowing a good driver for Cambodia, so I wanted to share a recommendation here.
For people going to Phnom Penh or to Cambodia in general and needing a driver, I can recommend the services of Mr Theary Leab. He is based in Phnom Penh but can drive you around anywhere in the country.
He has a website where you can find information about his services and how to reach him (email, what's app)
Home - Cambodia Driver Tour

I have been using his services several times over the past 15+ years and Theary has always provided very good and reliable service and at reasonable prices. And he is speaking well English so you can communicate easily with him.
I want to precise I have no financial interest at all in this. I am just recommending someone I appreciate and who is committed to his work, if it can be useful for someone here.