No, there is no specific format for writing a biography. You can write it in third person, first person or even second person. In fact, some people prefer to write their biographies in the style of a letter to their subject or in the voice of someone other than themselves (for example, using the words and phrases of another person who knew your subject well). To be an organized writer you can include the following: 

• A brief introduction of who you are writing about (their name and profession) 
• The main events that happened in their life and how they impacted them 
• A conclusion that summarizes what you learned from their story