Is a great believer in - Idioms by The Free Dictionary
be a great believer in (something) (redirected from is a great believer in)
be a great believer in (something)
To have a strong conviction that something (stated after "in") is important or worthwhile. I'm a strong believer in resting on the weekends so that I don't get burned out.
be a great/firm believer in something believe strongly that something is good, important or valuable: My mother was a great believer in horoscopes all her life. ♢ The boss was a firm believer in developing strong teamwork.