Question:
Israel Finkelstein (Hebrew: yshrl pynqlshtyyn, born March 29, 1949) is an Israeli archaeologist and academic. He is the Jacob M. Alkow Professor of the Archaeology of Israel in the Bronze and Iron Ages at Tel Aviv University Finkelstein is widely regarded as a leading scholar in the archaeology of the Levant and a foremost applicant of archaeological data in reconstructing biblical history. He is also known for applying the exact and life sciences in archaeological and historical reconstruction. Finkelstein is the excavator of Megiddo - a key site for the study of the Bronze and Iron Ages in the Levant.
From 1976 to 1990 Finkelstein taught at the Department of Land of Israel Studies, Bar-Ilan University, beginning as a teaching assistant. He spent the academic year of 1983-84 in a research group led by Prof. Yigael Yadin in the Institute of Advanced Studies in the Hebrew University, Jerusalem. In 1986-87 Finkelstein taught at the Department for Near Eastern Languages and Civilizations, University of Chicago. In 1987 he was appointed an associate professor with tenure at Bar-Ilan University and in 1990 moved to the Department of Archaeology and Ancient Near Eastern Civilizations at Tel Aviv University. In 1992/93 Finkelstein spent a sabbatical year as a visiting scholar at the Department of Near Eastern Languages and Civilizations, Harvard University. Since 1992, he has been a Full Professor at Tel Aviv University. He served as the chairperson of the Department of Archaeology and Near Eastern Studies (1994-98) and as Director of The Sonia and Marco Nadler Institute of Archaeology (1996-2003). In 1998-99 Finkelstein was a visiting scholar in the Centre de Recherche d'Archeologie Orientale and the Ecole Pratique des Hautes Etudes in the Sorbonne, Paris.  Finkelstein delivered series of lectures on the history and archaeology of Ancient Israel at the Texas Christian University (2002), the University of Buenos Aires (2011), the College de France in Paris (2012) and the Methodist University of Sao Paulo (2015). He is scheduled to deliver similar lectures at the Tokyo Christian University (2017) and the Pontifical Biblical Institute in Rome (2017). Finkelstein has read over 100 papers in international conferences and given numerous talks in universities around the globe.  Finkelstein has been the Editor of Tel Aviv, the journal of the Institute of Archaeology of Tel Aviv University, since 2008 and Executive Editor of the Monograph Series by the Institute of Archaeology, Tel Aviv University, since 2005. He is a member of editorial boards, including the Palestine Exploration Journal and the Archaeology and Biblical Studies series, the Society of Biblical Literature.
Answer this question using a quote from the text above:

what did he teach?

Answer:
He spent the academic year of 1983-84 in a research group led by Prof. Yigael Yadin in the Institute of Advanced Studies in the Hebrew University, Jerusalem.

Answer the question at the end by quoting:

Aesop ( EE-sop; Greek: Aisopos, Aisopos; c. 620 - 564 BCE) was a Greek fabulist and storyteller credited with a number of fables now collectively known as Aesop's Fables. Although his existence remains unclear and no writings by him survive, numerous tales credited to him were gathered across the centuries and in many languages in a storytelling tradition that continues to this day. Many of the tales are characterized by animals and inanimate objects that speak, solve problems, and generally have human characteristics.
Aesop may not have written his fables. The Aesop Romance claims that he wrote them down and deposited them in the library of Croesus; Herodotus calls Aesop a "writer of fables" and Aristophanes speaks of "reading" Aesop, but no writings by Aesop have survived. Scholars speculate that "there probably existed in the fifth century [BCE] a written book containing various fables of Aesop, set in a biographical framework." Sophocles in a poem addressed to Euripides made reference to Aesop's fable of the North Wind and the Sun. Socrates while in prison turned some of the fables into verse, of which Diogenes Laertius records a small fragment. The early Roman playwright and poet Ennius also rendered at least one of Aesop's fables in Latin verse, of which the last two lines still exist.  The body of work identified as Aesop's Fables was transmitted by a series of authors writing in both Greek and Latin. Demetrius of Phalerum made a collection in ten books, probably in prose (Aisopeion a) for the use of orators, which has been lost. Next appeared an edition in elegiac verse, cited by the Suda, but the author's name is unknown. Phaedrus, a freedman of Augustus, rendered the fables into Latin in the 1st century CE. At about the same time Babrius turned the fables into Greek choliambics. A 3rd-century author, Titianus, is said to have rendered the fables into prose in a work now lost. Avianus (of uncertain date, perhaps the 4th century) translated 42 of the fables into Latin elegiacs. The 4th-century grammarian Dositheus Magister also made a collection of Aesop's Fables, now lost.  Aesop's Fables continued to be revised and translated through the ensuing centuries, with the addition of material from other cultures, so that the body of fables known today bears little relation to those Aesop originally told. With a surge in scholarly interest beginning toward the end of the 20th century, some attempt has been made to determine the nature and content of the very earliest fables which may be most closely linked to the historic Aesop.

What did Aesop do as a fabulist?
The Aesop Romance claims that he wrote them down and deposited them in the library of Croesus;