Ron Howard (now)
There are multiple skills that Ron possesses. He is a brilliant actor and a very successful director and producer. However, going with the Hollywood culture, Ron is seen as the perfect fit for the TV shows and movies. He is also known for choosing his character wisely. Throughout his career, Ron has bagged to work in 27+ movies, he managed around 28 movies, and also created more than 20 movies. He made his career the best example to show people how to make use of an opportunity that has come your way.
Ron Paolillo (then)
The film Welcome Back Kotter has a huge fan base and the character of Arnold Horshack is loved by a lot of people. Paolillo was also a part of a children group in the high school where he was the class clown in the movie Sweathogs. The character was played quite brilliantly by the actor and it is one of his best performances. The unique feature of this role played by Ron was the hyena-like laugh that he practiced to master, just for this role.