Are you absolutely sure? I've not heard of your Mormon, but that may well be my lack of education.
I guess some of the "who invented it" is determined based on what's deemed as "TV" vs something far away from being viable.
Philo Farnsworth was the first to transmit electronic images (electronic on both ends - early television as we know it rather than a combination mechanical/electronic process that really had no potential).
https://en.wikipedia.org/wiki/Philo_Farnsworth