The phrase "assertive leader" is correct and usable in written English.
It can be used to describe a leader who is confident, direct, and able to express their opinions and needs clearly.
Example: "An assertive leader is essential for guiding the team through challenging projects and ensuring everyone is on the same page."
Alternatives: "confident leader" or "decisive leader".
David Wright is terrific, but not yet the assertive leader he may be someday.
"Ms. Yellen is also a more assertive leader than Mr. Bernanke and appears less averse to conflict.
BEHIND THE NEWS Mr. Medvedev's decision to sack Yuri M. Luzhkov seemed intended to show that he was an assertive leader and viable candidate for president in 2012.
Ms. Kwon was an assertive leader in the Second Concerto, holding her own alongside Mr. Taylor, the flutist Ransom Wilson and the piccolo trumpeter David Washburn.
From 1955 to 1972 Victoria was governed by the Liberal Party under Sir Henry Bolte a shrewd, earthy, and assertive leader and the state's most successful 20th-century politician.
Mr. Medvedev's decision, perhaps the most consequential of his tenure, seemed intended to make clear to Russia's political class that he was an assertive leader and a viable candidate for president in 2012.
[That was part of the journey of learning about myself, others, and God, which I write about in my upcoming book, The Variable Life.] Fellow introverts tell me they've felt underappreciated because they weren't vocal, assertive leaders, loud evangelists, or talented conversationalists with strangers.
In Italy, the conservative Northern League is making a comeback under an assertive new leader, Matteo Salvini, who has coupled opposition to immigration with criticism of the euro.
That Ms. Oliveros might find common cause with a courageous, assertive female leader, thriving in a futuristic milieu of instantaneous long-distance travel and telepathic communication, could only strike longtime followers of her work as prescient.
Suddenly after a summer of speculation, rumour, innuendo and adverse headlines, Omnicom is once again beginning to look like the assertive sector leader to which we had all grown accustomed.
But he also had a promising career as a street fighting boxer, and it was his reputation as a quick-witted and assertive gang leader that brought him to the attention of the legendary Clement "Coxsone" Dodd, operator of the famous Downbeat sound system that travelled the country playing the latest dance records from the United States.
