Based on this wikipedia entry you will, in your own words, summarize his most important contributions and the most significant or interesting parts of his life. Also he has influenced film and books, try to find out about them too.
Also, try to google and find the urban myth on how his death came to influence Apple, the Apple logo, and the Macintosh.
Post as a comment below.
Links of interest:
How does encryption work today on computers, for instance when you buy something on Amazon.com? (How long is a safe encryption key? How doe they work? How long does it take to ”brute force”-decrypt a safe key?)