He was a strong leader with unbounded optimism.

他是一位能力很强的领导，无比乐观。

《柯林斯英汉双解大词典》

He developed into a strong leader.

他成长为一名坚强的领导人。

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They all consider him (as) a strong leader.

他们都认为他是一个坚强的领导者。

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They think he is a strong leader. They say they don't necessarily agree with him on the issues they are most concerned about.

VOA: special.2010.01.23

Mr.Cleveland had been a strong leader, but Susan permitted many employees to make their own decisions.

VOA: special.2009.03.29

No more,no less." Roosevelt believed the United States needed a strong leader.

VOA: special.2010.08.12

"Andrew Strauss is a strong leader and I'll be right there supporting him, " said Flower.

BBC: Flower plays down 'distractions'

This type of assertive behavior is exactly what we would expect from a strong leader.

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"She was a strong leader, in contrast to what we have today, " Julia told me.

BBC: Margaret Thatcher: A tribute to conviction politics