In the example sentence, " A Gerardo le gusta hablar con la gente" Why is "a" in front of his name?

In the example sentence, " A Gerardo le gusta hablar con la gente" Why is “a” in front of his name?

Gerardo is the object of the sentence when you have a person that is the object of the sentence you need to put the preposition a in front of it. It is called “personal a”.

What Is the Personal A in Spanish and How Do You Use It? | FluentU Spanish
The Personal A of Spanish