From the ASCSA site (no … I do not understand why McMaster University has nothing mentioning this):
With great sadness, the School reports that Daniel Joseph Geagan passed away at St. Joseph’s Villa, Dundas, Ontario, Canada on Friday, February 6, 2009, in his 72nd year. He is survived by his wife, Helen Augusta von Raits Geagan and daughter, Augusta Helsby. Geagan’s life was devoted to education and work within his community. He was Professor Emeritus of History, McMaster University.
Geagan received his A.B. from Boston College and Ph.D. from Johns Hopkins University, and taught at Dartmouth College after serving in the military for two years. He joined the Department of History at McMaster University in 1973 and until 2001 he taught Ancient History, especially ancient Greece, with an emphasis on social and institutional history.
He was a Member of the School and the David M. Robinson Fellow in 1962-1963. His future wife, Helen Augusta von Raits, was also a Member that year. In 1963-64, he was an Associate Member and the Edward Capps Fellow. Geagan returned to the School in 1969-1970 as a Senior Research Fellow, holding a A.C.L.S. Fellowship. He was assigned to publish all Greek and Roman dedications from the Athenian Agora Excavations and the Latin inscriptions from the University of Chicago Excavations at Isthmia.
Geagan was the author of “The Athenian Constitution after Sulla”, Hesperia Supplement 12, published in 1967, and his publications include seven articles in Hesperia. His book, Inscriptions: The Dedicatory Monuments (Agora XVIII), will be published posthumously.
On a personal note … one of my teaching assignments during my Ph.D. pursuit at McMaster was to teach Dr. Geagan’s (very popular) second year Roman History course. I probably didn’t do it the justice it deserved … he will be missed.
rogueclassicism 
Thank you for your post on my dear friend Dan. He cared deeply about his students and his work. His final book is to be published soon. I too, am puzzled that McMaster has not seen fit to recognize his dedication. His humanitarian work and consequent interest in politics were the signals of a very selfless and caring human being and a very complex person.