The friend that mattered most – Facebook chief Mark Zuckerberg was set on the path to success by a chance meeting with former Washington Post Company Chairman Don Graham in 2005. They developed a close bond that has endured to the present, with Graham now serving as a company director.
Blazing a trail – Yahoo CEO Marissa Mayer was mentored by Google co-founders Larry Page and Sergey Brin after becoming the first female engineer at the company.
Pass it on – In turn, Larry Page was advised by the late Apple visionary Steve Jobs, although the pair later clashed over the battle between their smartphone models.
Strategy begins at home – Meg Whitman, CEO of Hewlett-Packard with a fortune approaching $2 billion, cites her father Hendricks Hallett Whitman, Jr. as the biggest influence on her career.
Continuing the legacy – Nobel Prize-winning economist Paul Krugman was heavily influenced by his professor at MIT, Rudi Dornbusch, whom he credits with introducing international macroeconomics to the world.
Sorceror's apprentice – Amazon CEO Jeff Bezos was inspired by his former boss, hedge-fund manager David Shaw.
Everybody needs help – Warren Buffett, one of the world's richest men and most successful investors, said business guru Benjamin Graham "had been my idol ever since I read his book The Intelligent Investor."
Righting the ship – Julian Castro, the man tasked by President Obama with re-starting the boom years as US Secretary of Housing and Urban Development, was mentored by a previous holder of the position: Henry Cisneros.
Best of enemies – Salesforce chairman and CEO Marc Benioff describes Oracle's Larry Ellison as his mentor, although they have been in competition in recent years.
Carrying the torch – Former Cosmopolitan editor-in-chief Helen Gurley Brown was among the most powerful women in the media business. She passed the baton to her protege, Betsy Perry.