Originator of the idea / Father of the idea
The person who first conceived or originated the idea.
(The Modern Hebrew usage)
Translation
Expression (Hebrew)
אֲבִי הָרַעְיוֹן
Definition (Hebrew)
הָאָדָם שֶׁהָגָה אֶת הָרַעֲיוֹן לָרִאשׁוֹנָה.
(הָעִבְרִית הַחֲדָשָׁה)