Write an introduction that sets the tone for the essay and includes your thesis statement. Begin with an interesting fact or description about the person you interviewed. This immediately gives a context for the interview and grabs the reader's attention.
Introduction paragraphs are usually about 5% of your essay word count. In clearly-written sentences, the writer gives some background on the main topic; explains the academic problem and tells the reader what to expect in the rest of the essay. You can follow a basic pattern (recipe) for writing introduction paragraphs to help you get started.