What is the web page or email address of the
Robert S. Lopez who wrote _The Commercial Revolution_?

Hi bugbear,

Okey dokey, here you go. 

1) CONFIRMATION OF DEATH:
1948 U.S. and Canadian Fellows:
"Robert Sabatino Lopez, Deceased. Economic History: 1948, 1951"
http://www.gf.org/48fellow.html

2) CONFIRMATION THAT ROBERT SABATINO LOPEZ IS THE SAME FELLOW AS ROBERT S. LOPEZ:
"Lopez, Robert Sabatino. The Commercial Revolution of the Middle Ages,
950- 1350. Cambridge: Cambridge University Press, 1976."
http://www.sparknotes.com/history/european/middle2/bibliography.html

3) BIRTHDATE:
Lopez, Robert Sabatino, 1910-
http://www.pitbossannie.com/aus-hf-lopez-robert-sabatino.html

(birthdate & list of books):
Library of Congress List for Lopez, Robert Sabatino:
http://catalog.loc.gov/cgi-bin/Pwebrecon.cgi?Search_Arg=lopez%2C+robert&Search_Code=NAME_&PID=18258&CNT=25&BROWSE=4&HC=15&SID=7

4) CONNECTICUT CONNECTION:
"Medieval Trade contains about two hundred documents translated, with
commentaries by Lopez, who was a Professor of History at Yale, and
edited by Raymond, who was a Professor of History at the City
University of New York."
http://www.h-net.org/reviews/showrev.cgi?path=162841038241033

5) CONFIRM CONNECTION OF NAME/BIRTH/NEW HAVEN, CT:
Searched the FamilyTreeMaker website...
Social Security Death Index: "lopez robert" and "1910":
LOPEZ, ROBERT
Birth: 8 Oct 1910 / Death: Jul 1986
http://familytreemaker.genealogy.com/fto_ssdisearch.html

Special thanks to omnivorous-ga for getting in touch with me to say
that he/she was also able to confirm "through the Gale Contemporary
Authors Online, a fee-based service available at many public
libraries, that Lopez died in July, 1986 in New Haven, CT.
The historian and author was born October 8, 1910, in Genoa. He
immigrated to United States in 1939. He was educated at the University
of Milan (1932)and received his Ph.D. from the University of Wisconsin
in 1942."

I'm happy we were able to find this information for you and it is kind
of you to accept it as an answer.

Thank you,
hummer

Google Search Terms Used:

"Lopez, Robert Sabatino"
"Robert Sabatino Lopez"
"Robert S. Lopez"

Good heavens.  That is very thorough.

Hi bugbear,

I'm sorry to report that he is probably deceased, although I haven't
been able to confirm that.

"Robert Lopez was one of the best medieval historians ever. In his
specialization, economic history, he was responsible for much
ground-breaking and revolutionary work. Like all historians who master
their field, Lopez set out, at the end of his career, to write his own
survey work on medieval history. This is it."
http://www.book.nu/0871318636

Regards,
hummer

Well, that is about as conclusive an answer as one could want.
He probably is dead, considering how long ago this book was
published.  If you can find a little more evidence, I'll 
accept this as the answer.

Thank you, bugbear, I'm happy you are happy. Yes, I guess it is safe
to say that the fellow is no longer with us, but he probably has a
very good view of history now. Stay warm, hummer