I have a PhD in Computer Science and have been working as a "pure researcher" in an academic setting for the past 10+ years. I have a decent publication record, with a large number of citations to my work. As part of the research role, I have also been a co-supervisor/advisor of several PhD students and done presentations in front of conference audiences. I've done a bunch of "guest lectures" in a few undergraduate classes.
I'd like to transition from the current pure research position to a mixed teaching and research role. My motivations are to have more contact with people (as research can be lonely) and better job security. To than end I've applied for several teaching positions (tenure-track associate professor), but I've been told that the lack of teaching/lecturing experience (undergraduate students) is a problem.
Why would the selection committee see the lack of teaching experience as a deal-breaker?
I do understand that teaching requires a different set of skills than research. However, teaching skills can be learned, so is this a case of demonstrating the capability of learning such skills? If so, what would be some acceptable strategies for obtaining such skills?