We gratefully acknowledge support from the following:

• Google corporation, through a Google Research Awards Grant, for work with Prof. Charles Bigelow on collecting and analyzing font metrics in historical books (2011-2012)
• The National Science Foundation (NSF), through an IIS/III grant for work in math recognition and retrieval (2010-2013), and associated NSF REU supplements (Summer 2011 and Summer 2012)
• RIT Carlson Center for Imaging Science (summer support for Video CAPTCHA research, 2010, 2011)
• Xerox Corporation (through a University Affairs Committee Grant held with Bill Stumbo, Xerox Research Center Webster, 2007-2009)
• The Center for Electronic Imaging Systems (CEIS/NYSTAR), through a CAT-EIS grant (2008-2009).
• The B. Thomas Golisano College of Computing and Information Sciences (FEAD Grant, 2007)
• Walter Wolf (who donated a Tablet PC)