The phrase "a vocal proponent for" is correct and usable in written English.
It can be used when describing someone who actively supports or advocates for a particular cause or idea, often expressing their views openly.
Example: "She has always been a vocal proponent for environmental conservation, speaking at various events to raise awareness."
Alternatives: "an outspoken advocate for" or "a strong supporter of".
He checked all the boxes: solidly pro-life, champion of traditional marriage, and a vocal proponent for religious liberty – and yet he never quite connected with what should have been his core constituents.
Mr. McClendon, who is the most public face of the shale gas drilling boom and a vocal proponent for switching the country's electricity production from coal to gas, is a co-founder of Chesapeake and the only chief it has ever had.
One frequent driver is Henry Merritt of Redding, a great-nephew of the man the parkway was named for — Congressman Schuyler Merritt of Stamford, who throughout the 1920s and '30s was a vocal proponent for the parkway and helped the state acquire the needed land.
Strenger is a vocal proponent for improvement in German corporate governance practices, where cross-shareholdings and insignificant disclosure levels have been commonplace.
Jentsch eventually moved and hired security guards, but he has continued his research and has become a vocal proponent for the use of lab animals.
"It's not that there's an activity called 'science' and there's a separate activity called 'replication,' " says Gary King, director of the Institute for Quantitative Social Science at Harvard University and a vocal proponent for data sharing and replication.
As the leader of the Melkite church in Egypt Zoghby was a vocal proponent of rights for Christians, and opposed the limitations placed on them by that country's Law of Personal Statutes.
Rae herself is a vocal proponent of creating for the web, which is in many ways a more accessible avenue for emerging creators trying to get their foot in the door.
The sports authority's president, George Zoffinger, a vocal proponent of the Jets' proposal for a megastadium, said that the Jets "put a lot of thought on the table that hadn't been there before," but he added that "the Giants are still fighting Mills, which is what I don't understand".
McCain's daughter Meghan McCain -- a vocal proponent of marriage equality -- posed for NOH8 last summer.
By Rebecca Mead December 14, 2016 Betsy DeVos, Donald Trump's nominee for Secretary of Education, is a vocal proponent of charter schools, voucher programs, and virtual education but not of public schools.
