Three Pioneers in Electromagnetism

It was a very anxious morning for Daniel. He was absent for the entirety of the previous week due to a cold, and on this very day, when he was going to return to classes, their Science class would also be having a long quiz about the five main pioneers of electromagnetism.
It's too early in the morning to be awake, but I don't know much about some pioneers of electromagnetism!
I already know Oersted and Faraday, but I don't have a single clue about Ampère, Maxwell nor Hertz!
Not knowing anything about the three of the five pioneers of electromagnetics, he decides to ask his mother if she knows anything about them.
Mom, do you know who Ampère, Maxwell, or Hertz were?
I only remember who Ampère was, but anyway, let me tell you facts about him.
The pioneers of electromagnetics? Let me think.
He's a French physicist and was one of the people who originally founded the science of classical electromagnetics. He tried to develop a theory about the relation of electricity and magnetism.
He also tried to use mathematics in generalizing physical laws from the results of his experiments, for example producing Ampère's law. I forgot for what this law was being used for, though.
He showed that two parallel wires carrying electric currents can either attract or repel each other depending on if they flow in the same or opposite direction.