日本では、あまり会社のトップの人を「首長」とは言わないと思います。
「社長」「会長」「所長」「責任者」この辺りで、英語に合いそうな言葉を探してみてください。

※こちらは、日本語で書いてみました。

I was able to understand what you wrote but I cant respond back in Japanese.

To summerise what you wrote:
Almost nobody uses 首長 as it means "Chieftain" in English which would usually be used in reference to a village leader not a company one.

Words like 会長,所長,責任者 would be used in Japanese. And I should update my English sentence to reflect the new Japanese words?

彼は会社の社長です。
He is the company president.
He is the president of the company.

If you agree with the new sentences above I will update.

>Words like 会長,所長,責任者 would be used in Japanese. And I should update my English sentence to reflect the new Japanese words?

Well, I think that's one way to do it.
Another way, if both English sentences are correct and natural, we can unlink one of them, like we did with [#10193537]. I think that you can't unlink yet since you're still just a contributor, so if you want to, please let me know. You can choose either way.

>If you agree with the new sentences above I will update.
I think those are a good match.
(I think that is a good match [?]/ I think those are good match [?])

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