彼はこの業界では伝説的な人物だの英語

He's a legend in his own time.

He is known as a trendsetter in this field.

He's a blot on our profession.

He has become a legend in his own time for his scientific discoveries.

he was famous for his reading of Mozart

He became a living legend.

He has a reputation as a legendary lothario.

I see that he is an able man.

He is well known as a novelist to the reading public

He is looked up to as an authority on English.

He typified the times in which he lived.

He is a famous person and appeared on TV a lot.

He is a big kahuna for the company.

He is considered one of the leading figures of the digerati.

He is the most successful character.

He is a big man in the company.

He is a most important person.

He is now a leading figure [authority] in the field of gene therapy.