Heidrick & Struggles International (HSII) 10-Q 2015 Q1 Quarterly report

Exhibit 32.1

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Heidrick & Struggles International, Inc., a Delaware corporation (the “Company”), does hereby certify that:

The Quarterly Report onForm 10-Q for the quarter ended March 31, 2015 (the“Form 10-Q”) of the Company fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934 and the information contained in theForm 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: April 28, 2015	/s/ Tracy R. Wolstencroft
	Tracy R. Wolstencroft
	Chief Executive Officer