What is the meaning of "person Perkin consulted"?

I found the following sentence on one of books that I've read. However, I cannot understand the sentence exactly.

What was the name of the person Perkin consulted before setting up his own dye works?

Please someone let me know which of the following sentences has the similar meaning.

What was the name of the person who Perkin consulted before setting up his own dye works?

What was the name of the person who is Perkin consulted before setting up his own dye works?