EXHIBIT 31.1
                                  CERTIFICATION

I, Allen S. Greene, certify that:

1.   I have reviewed this quarterly report on Form 10-QSB of SmartPros Ltd.;

2.   Based on my knowledge, this report does not contain any untrue statement of
     material  fact or omit to  state a  material  fact  necessary  to make  the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my  knowledge,  the  financial  statements,  and  other  financial
     information  included  in  this  report,  fairly  present  in all  material
     respects the financial  condition,  results of operations and cash flows of
     the small  business  issuer as of, and for,  the periods  presented in this
     report;

4.   The  small  business  issuer's  other  certifying   officer(s)  and  I  are
     responsible  for  establishing  and  maintaining  disclosure  controls  and
     procedures  (as defined in Exchange Act Rules  13a-15(e) and 15d-15(e)) for
     the small business issuer and have:

        a) Designed  such  disclosure  controls and  procedures,  or caused such
           disclosure   controls  and   procedures  to  be  designed  under  our
           supervision,  to ensure  that  material  information  relating to the
           small business  issuer,  including its  consolidated  subsidiaries is
           made known to us by others within those entities, particularly during
           the period in which this report is being prepared;

        b) Evaluated the effectiveness of the small business issuer's disclosure
           controls and procedures and presented in this report our  conclusions
           about the effectiveness of the disclosure controls and procedures, as
           of the  end of the  period  covered  by  this  report  based  on such
           evaluation; and

        c) Disclosed  in this report any change in the small  business  issuer's
           internal  control over financial  reporting that occurred  during the
           small  business  issuer's  most  recent  fiscal  quarter  (the  small
           business  issuer's  fourth  fiscal  quarter  in the case of an annual
           report) that has  materially  affected,  or is  reasonably  likely to
           materially  affect, the small business issuer's internal control over
           financial reporting; and

5.   The  small  business  issuer's  other  certifying  officer(s)  and  I  have
     disclosed,  based on our most recent  evaluation  of internal  control over
     financial reporting,  to the small business issuer's auditors and the audit
     committee of the small  business  issuer's  board of directors  (or persons
     performing the equivalent functions):

        a) All significant deficiencies and material weaknesses in the design or
           operation of internal  control  over  financial  reporting  which are
           reasonably  likely to adversely  affect the small  business  issuer's
           ability  to  record,   process,   summarize   and  report   financial
           information; and

        b) Any fraud, whether or not material, that involves management or other
           employees who have a significant role in the small business  issuer's
           internal control over financial reporting.

Date:  August 7, 2007
                                                     /S/  ALLEN S. GREENE
                                                     ---------------------------
                                                          Allen S. Greene
                                                     Chief Executive Officer