The phrase "an active proponent" is correct and usable in written English.
It can be used to describe someone who actively supports or advocates for a particular cause, idea, or policy.
Example: "As an active proponent of environmental sustainability, she regularly participates in community clean-up events."
Alternatives: "a strong advocate" or "a passionate supporter."
Jones was also an active proponent of legislation to prohibit child labour.
But the administration will need to become an active proponent of this expansion if it is to occur.
Politically, Bush remained an active proponent of immigration reform and education reform standards commonly known as Common Core.
David was an active proponent of the French Revolution who voted to execute Marie Antoinette then drew her, with what looks like compassion, in the tumbril.
Senator Charles E. Schumer has been an active proponent of the pipeline; Senator Hillary Rodham Clinton has been quieter on the project, but supports it.
Olah is an active proponent of the "methanol economy": "What I'm saying is that we have the basis of carbon dioxide that can be recycled," he says.
While not a publicly active proponent of racial integration, Mr. Branch worked on its behalf behind the scenes and was an occasional informal adviser to the Rev. Dr. Martin Luther King, his daughter said.
Question 755 was "a pre-emptive strike," in the words of its most active proponent, Republican State Representative Rex Duncan, whose portrait hangs in the Kumback.
As a lawyer, mother of two boys in public school, and active proponent of the Hindu American Foundation's (HAF) Take Back Yoga Project, I couldn't agree more.
It may be the private sector's most vocal and active proponent of fair-chance employment.
In New York City, where Mayor Michael R. Bloomberg has become the country's most active proponent of gun control, the rules imposed on gun ownership are laudably even more rigid than those of New York State, which already has some of the strictest laws in the country.
