Describe someone who is very professional
You should say:
Who this person is
Who this person does
How you knew this person
And explain why this person is professional
In high school, my math teacher is very professional and has a great influence on me. Before high school, my math grade too low to hate math. I think math formulas so hard that memorize, and the answer steps also complicated. However, after I met Miss Li, she taught me many different skills.
The biggest difference between Miss Li and other math teachers is using life experience to explain math problems. In general, many math teachers encourage students memorizing lots of formulas and doing a lot of exercises. Sometimes it is hard for me to know where this formula comes from and why it should be done. However, Mr. Li easier to solve mathematical problems by telling the history of mathematical formulas. Sometimes, even if you didn't need extra time to memorize, you could remembered the formulas in class.
Although Miss Li is not the most successful math teacher in our high school. Nevertheless, his teaching style is clearer and easier to understand mathematics. So I always thought he was the most professional math teacher.