EXHIBIT 99.1

CERTIFICATIONS OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO TITLE 18, UNITED STATES CODE, SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Natus Medical Incorporated (the “Company”) on Form 10-Q for the quarterly period ended March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Tim C. Johnson, President and Chief Executive Officer of the Company, certify, pursuant to Title 18, United States Code, Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    Tim C. Johnson

Print Name: Tim C. Johnson

Title: President and Chief Executive Officer

Date: May 14, 2003

In connection with the Quarterly Report of Natus Medical Incorporated (the “Company”) on Form 10-Q for the quarterly period ended March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Glenn A. Bauer, Chief Financial Officer of the Company, certify, pursuant to Title 18, United States Code, Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)  The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    Glenn A. Bauer

Print Name: Glenn A. Bauer

Title: Chief Financial Officer

Date: May 14, 2003