                                                                  EXHIBIT 31.1

I, Robert C. Stempel, certify that:

  1.  I have reviewed this quarterly report on Form 10-Q of Energy Conversion
  Devices, Inc.;

  2.  Based on my knowledge, this report does not contain any untrue
  statement of a 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 registrant as of, and for, the periods presented in this report;

  4.  The registrant's other certifying officer 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 registrant 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
     registrant, 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 registrant'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 registrant's
     internal control over financial reporting that occurred during the
     registrant's most recent fiscal quarter (the registrant's fourth
     fiscal quarter in the case of an annual report) that has materially
     affected, or is reasonably likely to materially affect, the
     registrant's internal control over financial reporting; and

  5.  The registrant's other certifying officer and I have disclosed, based
  on our most recent evaluation of internal control over financial reporting,
  to the registrant's auditors and the audit committee of the registrant'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 registrant'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 registrant's
     internal control over financial reporting.



  Date: February 17, 2004                  /s/ Robert C. Stempel
                                           ------------------------------
                                           Robert C. Stempel
                                           Chief Executive Officer



