* late: adjective (describes the noun "anthropologist")
* anthropologist: noun (the person being described)
* Dr.: abbreviation (short for "Doctor", functioning as an adjective modifying "Louis Leakey")
* Louis: proper noun (a specific person's name)
* Leakey: proper noun (a specific person's surname)
Note: "Dr. Louis Leakey" together forms a noun phrase, which is functioning as the object of the implied sentence.