David Clark is a world-renowned expert on Warren Buffett’s Investment philosophies. He grew up with Buffett’s children and eventually fell under the influence of the master investor. He then developed a friendship with Mary Buffett when latter married Warren’s son Peter. Mary and David discovered that they share the same enthusiasm for studying Warren’s investment methods, which sparked into a professional relationship between the two. Their alliance soon blossomed into a long-term collaboration project — writing seven investment books on Warren Buffett’s investment methods.