Published on February 22, 2010
Exhibit
3
The
undersigned, Charles E. Harris and Susan T. Harris, hereby agree to file jointly
this 13D and all amendments, with respect to the Common Stock of Harris &
Harris Group, Inc., but disclaim that they are a group.
Date: February
22, 2010
/s/ Charles
E. Harris
Charles
E. Harris
/s/ Susan
T. Harris
Susan T.
Harris