Mark Leonard hosted conference call on impact of AI days before resigning for health reasons.Constellation Software’s founder and chief executive Mark Leonard stepped down from his position after 30 years at the company this week, citing health reasons. The software giant’s stock price hasn’t recovered. Leonard, who founded the company 30 years ago, will remain on the board. Mark Miller, who joined the company in 2001, was appointed as president in his stead. Miller previously led Volaris Group, an acquisi ...