Exhibit 16.1 [LOGO OF ARTHUR ANDERSEN] March 5, 2002 Mr. Thomas J. Clarke Chief Executive Officer TheStreet.com, Inc. 14 Wall Street New York, NY 10005 Dear Mr. Clarke: This is to confirm that the client-auditor relationship between TheStreet.com and Arthur Andersen LLP will terminate upon completion of the audit of the 2001 financial statements and the filing of the related Form 10-K. Our resignation results from the inability of our Firm to continue to work with TheStreet.com in a cooperative manner. This has been directly caused by what we believe to be inappropriate public comments about our Chief Executive Officer and our Firm made by a member of your Board of Directors. Very Truly Yours, /s/ Thomas J. Duffy - --------------------------------- Thomas J. Duffy