EXHIBIT 4 AGREEMENT RELATING TO JOINT FILING OF SCHEDULE 13D In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, the undersigned agree to the joint filing of a Statement on Schedule 13D by amending the Schedule 13D...

                                                                       EXHIBIT 4


               AGREEMENT RELATING TO JOINT FILING OF SCHEDULE 13D

      In accordance with Rule 13d-1(k) promulgated under the Securities Exchange
Act of 1934, the undersigned agree to the joint filing of a Statement on
Schedule 13D by amending the Schedule 13D filed by H. Xxxxxxxxxxx Xxxxxxx
(including any and all amendments thereto) with respect to the shares of Class A
Common Stock, $0.01 par value, of Edison Schools Inc., and further agree that
this Joint Filing Agreement be included as an Exhibit thereto.

Dated:  July 21, 2003


                              By:   H. XXXXXXXXXXX XXXXXXX


                              /s/ H. Xxxxxxxxxxx Xxxxxxx
                              ---------------------------------------------
                              H. Xxxxxxxxxxx Xxxxxxx


                              By:   XXXXXXXXXXX X. XXXX


                              /s/ Xxxxxxxxxxx X. Xxxx
                              ---------------------------------------------
                              Xxxxxxxxxxx X. Xxxx


                              By:   SHAKESPEARE ACQUISITION LLC



                              By:       /s/ H. Xxxxxxxxxxx Xxxxxxx
                                 ------------------------------------------
                                     Name:  H. Xxxxxxxxxxx Xxxxxxx
                                     Title: Chief Executive Officer


                              By:   XXXXX X. XXXXXXX


                              /s/ Xxxxx X. Xxxxxxx
                              ---------------------------------------------
                              Xxxxx X. Xxxxxxx


                              By:   G. XXXXXXX XXXXXXX


                              /s/ G. Xxxxxxx Xxxxxxx
                              ---------------------------------------------
                              G. Xxxxxxx Xxxxxxx


                              By:   XXXXXXX X. XXXXXX


                              /s/ Xxxxxxx X. Xxxxxx
                              ---------------------------------------------
                              Xxxxxxx X. Xxxxxx




                              By:   XXXX X. XXXXXX


                              /s/ Xxxx X. Xxxxxx
                              ---------------------------------------------
                              Xxxx X. Xxxxxx


                              By:   XXXXXXX X. XXXXXX


                              /s/ Xxxxxxx X. Xxxxxx
                              ---------------------------------------------
                              Xxxxxxx X. Xxxxxx


                              By:   XXXXXX X. XXXXX, III


                              /s/ Xxxxxx X. Xxxxx, III
                              ---------------------------------------------
                              Xxxxxx X. Xxxxx, III


                              By:   XXXXXXX X. XXXXXX


                              /s/ Xxxxxxx X. Xxxxxx
                              ---------------------------------------------
                              Xxxxxxx X. Xxxxxx


                              By:   XXXXXX X. XXXXX


                              /s/ Xxxxxx X. Xxxxx
                              ---------------------------------------------
                              Xxxxxx X. Xxxxx


                              LIBERTY PARTNERS HOLDINGS 43, L.L.C.

                              By: Liberty Partners, L.P., its Manager

                              By: PEB Associates, Inc., its General Partner

                              By:       /s/ Xxxxxxx X. Xxxxxx
                                 ------------------------------------------
                                     Name:  Xxxxxxx X. Xxxxxx
                                     Title: Vice President



                              LIBERTY PARTNERS, L.P.

                              By: PEB Associates, Inc.



                              By:       /s/ Xxxxxxx X. Xxxxxx
                                 ------------------------------------------
                                     Name:  Xxxxxxx X. Xxxxxx
                                     Title: Vice President


                              PEB ASSOCIATES, INC.



                              By:       /s/ Xxxxxxx X. Xxxxxx
                                 ------------------------------------------
                                     Name:  Xxxxxxx X. Xxxxxx
                                     Title: Vice President


                              LIBERTY INVESTMENT PARTNERS 43



                              By:       /s/ Xxxxxxx X. Xxxxxx
                                 ------------------------------------------
                                     Name:  Xxxxxxx X. Xxxxxx
                                     Title: General Partner