The Financial Post reports in its Tuesday edition that Mark Leonard, founder of Constellation Software, resigned as president on Thursday. The Post's Serah Louis writes that chief operating officer Mark Miller was promoted to president and Mr. Leonard will stay on as board member, Constellation said. Mr. Leonard is sometimes likened to Warren Buffett, thanks to his long-term hold strategy and sustainable profits. He built Constellation into a global company with six units and a portfolio of hundreds of companies, which operates in more than 100 markets and generates consolidated revenues more than $6-billion (U.S.). Mr. Leonard owns a 1.9-per-cent interest in Constellation, worth about $1.21-billion (U.S.). Constellation management says Mr. Leonard made the decision to step down as president due to a "serious" health issue. Constellation has returned nearly 30,000 per cent since it went public in 2006, including dividends, compared with the 670-per-cent return of the technology portion of the S&P/TSX Composite index, Bloomberg reported. National Bank's Richard Tse cut Constellation to "sector perform" from "outperform." He says none of the operating heads will "carry the same cachet as Mark Leonard."