I use "Doctor" in only one setting.  If I encounter a colleague who
insists on being called "Doctor" (e.g., in a committee meeting), I, of
course, acquiesce but only if that person addresses me as "Doctor Doctor".
It has worked every time.  Otherwise, for students and colleagues alike, I
prefer "Michael".

      When asked in class, I mention my preference once and never again.
Typically, only one student in a classroom ever believes me and/or feels
comfortable enough to do so.  In the last several years I have notice that
students have shifted from a routine "Doctor" to a routine "Professor",
both with and without having heard my preference.

Michael

Professor Michael J. O'Hara, J.D., Ph.D.
Finance, Banking, & Law Department
College of Business Administration
Roskens Hall 502
University of Nebraska at Omaha
Omaha  NE  68182
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(402) 554 - 2823 voice  fax (402) 554 - 2680
http://cba.unomaha.edu/faculty/mohara/web/ohara.htm