It takes a LOT of influence to directly affect culture at a company. If you don't have the amount of influence the best you can hope to do is spread and promote

It takes a LOT of influence to directly affect culture at a company. If you don't have the amount of influence the best you can hope to do is spread and promote the ideas; just like in society. Except, it's a bit easier to change jobs than to change the society you live in :)