I find this passage from Work Rules! by Laszlo Bock (p. 209) completely inspiring, and a wonderful statement of why I believe in ongoing, school-specific job training directed by teacher leaders:
I can't tell you what to teach your team or organization, since that depends on what your goals are. I can't tell you whether the best way to teach is in person or remotely, through self-study or group classes. That will depend on how your people learn best, and whether they are trying to learn job-specific skills, such as a new programming language, or more general skills, such as how to work better together as a team.
I can, however, tell you where to find the best teachers.
They are sitting right next to you.
I promise you that in your organization there are people who are expert on every facet of what you do, or at least expert enough that they can teach others.