Jefferies Financial (JEF) 10-Q 2010 Q1 Quarterly report

Exhibit 32.1

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED BY SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Ian M. Cumming, as Chairman of the Board and Chief Executive Officer of Leucadia National Corporation (the "Company") certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1)           the accompanying Form 10-Q report for the period ending March 31, 2010 as filed with the U.S. Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date:  May 5, 2010	By:	/s/   Ian M. Cumming
		Name:  Ian M. Cumming
		Title:  Chairman of the Board and Chief Executive Officer