proposer
US /prəˈpoʊ.zɚ/
UK /prəˈpoʊ.zɚ/

1.
proponente, proponedor
a person who puts forward a proposal or proposition.
:
•
The proposer of the new policy explained its benefits.
El proponente de la nueva política explicó sus beneficios.
•
Each proposer was given five minutes to present their idea.
Cada proponente tuvo cinco minutos para presentar su idea.