EXHIBIT 31.1

                              OFFICER'S CERTIFICATE
                            PURSUANT TO SECTION 302*

      I, Robert Legnosky, Chief Executive Officer and Interim Chief Financial
Officer, certify that:

      1. I have reviewed this form 10-K for the fiscal year ended December 31,
2004 of Celerity Systems, 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(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 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) Omitted;

            (c) 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

            (d) Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the small business
issuer'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 small business issuer's internal control over
financial reporting; and

      5. The registrant's other certifying officer(s) and I have disclosed,
based on my 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:    April 14, 2005               By:      /s/ Robert Legnosky
                                               -------------------
                                      Name:    Robert Legnosky
                                      Title:   Chief Executive Officer/Interim
                                               Chief Financial Officer

*The introductory portion of paragraph 4 of the Section 302 certification that
refers to the certifying officers' responsibility for establishing and
maintaining internal control over financial reporting for the company, as well
as paragraph 4(b), have been omitted in accordance with Release No. 33-8545
(March 2, 2005) because the compliance period has been extended for
non-accelerated filers until the first fiscal year ending on or after July 15,
2006.