Tā kānchēng wǒmen zhège shídài zuì wěidà de kēxuéjiā zhī yī.
He can be called one of the greatest scientists of our era.
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堪称 is formal and literary, often used in news, reviews, and speeches. In casual conversation, you'd more likely just say 算得上 (suàndeshàng) or 可以说是 (kěyǐ shuō shì).