Chaplains, of course, have been missionaries within the workplace culture for decades. Workplaces are still one of the few places where the word 'chaplain' isn't denigrated (although here in NZ, some of those who were called chaplains now go under slightly different names - workplace chaplaincy has become workplace support, for instance).

All Weather Windows has over 1,000 employees representing 46 different countries, so Gowler is working with people from different religious backgrounds as well as with those who have no spiritual upbringing. "We have Sikhs, Buddhists, and a number of Hindus. (The population of our plant is probably 20% to 25% Vietnamese, so a lot of the eastern faiths are represented, especially Buddhism.)"
While there is no 'proselytizing' allowed, Gowler has plenty of room to speak to people about faith issues when they arise. He uses his own Christian background as a base to discuss these issues, whether the people he's talking to are Christian or not.