The phrase "top authority" is correct and can be used in written English.
Example: The top authority in the government has decided to implement new policies to improve the economy.
The book attracted international attention, and its author was hailed as the nation's top authority in the new field of electronic technology.
A reporter, awed by his reputation as the world's top authority on ethnobotany, asked how he should be described.
Under the French system, the president exercises top authority while the prime minister handles day-to-day affairs.
But the party chief, Tian Xirong, the city's top authority, was recently promoted to deputy director of the provincial Parliament.
"You could tell us about... us," Woolwrap decides, gung-ho because the idea comes from top authority, namely himself.
The church's top authority is its president and prophet, Thomas S. Monson, but at age 86 his strength is waning, according to many familiar with the church's leadership.
"I felt accepted by everyone, from the top authorities to common people," he says.
As such, analysts say, top authorities have tacitly approved Bo's defiant performance.
Although I knew my orders were criminal, I never dared challenge the top authorities".
Professor Stuart Hart is one of the world's top authorities on the implications of sustainable development and environmentalism for business strategy.
Mr. O'Connor, who is widely viewed as one of the top authorities on Pollock, said art forensics are valuable, but in this case he found the results "redundant and essentially irrelevant".
