Larry Maccherone is well known in the Agile space for having conducted the largest study ever on the impact of agile practices in the workspace. While he was at Rally (now part of CA), Larry collected data from over 10,000 teams to determine things like, most effective team size, most effective Sprint length, etc.
At Agile 2018, Larry gave a talk called Agile Quantified (Measuring the Impact of Agility). During the talk he explained how the data was gathered, and some of the key learnings.
But, in addition to his work on Agile metrics, Larry also has a background with a deep focus on security and in this interview he explains how DevOps and Security work together, how the growth in DevSecOps is SO much bigger than what is happening in Agile and why we all need to be paying more attention to it.
Larry's session at Agile 2018:
Agile Quantified (Measuring the Impact of Agility)
The current version of the research Larry did for Rally can be found here: