One way he be might doing this while not sacrificing substance is if he's the head of a very large group. If you have 20 postdocs and 40 grad students, that wou

One way he be might doing this while not sacrificing substance is if he's the head of a very large group. If you have 20 postdocs and 40 grad students, that wouldn't be a crazy number of papers over five years. Alternatively, he might be highly collaborative - if he's usually not the last author, he might just be farming out computational/mathematics staff to projects that need those skillsets (which frankly would be awful for the careers of those mentees, but it would explain what you're seeing). That said, two papers a month is setting off my bullshit alarms - I'd take a hard look at those papers and just see if he's solving real problems or not.