Constellation Software Inc. has returned nearly 30,000 per cent since it went public in 2006, including dividends. Photo by Laura Proctor/Bloomberg files

Mark Leonard, the notoriously media-shy founder of Constellation Software Inc. , resigned as president of the Toronto-based tech juggernaut on Thursday due to health reasons, the firm said. Chief operating officer Mark Miller was promoted to president and Leonard will stay on as board member, Constellation said. Who is Leonard, the man behind one of the world’s top tech portfolios who is sometimes likened to Warren Buffett ? Here, Financial Post delves into Leonard’s background, what Constellation does and how his departure could affect the company.

Who is Mark Leonard?

Constellation’s reclusive, sixty-something founder, who shun

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