To convince managers I believe you should emphasize at the language’s practical potential. Nowadays there’s nothing as important as software scalability, and you have a beautiful story to tell: the scalable and composable concurrency using the Software Transactional Memory model, the semi-implicit and explicit parallelism, the distributed systems programming (e.g., clusters) using Cloud Haskell. There also are thousands of open-source libraries http://hackage.haskell.org/packages/ in the every growing central repo. The community is eager to help http://stackoverflow.com/questions/tagged/haskell. There are lots of video presentations covering the topics I mention. I recommend walking thru the ones by Simon Peyton Jones https://skillsmatter.com/legacy_profile/simon-peyton-jones#skillscasts for a start.