EXHIBIT 23.4 INDEPENDENT AUDITORS' CONSENT The Board of Directors Human Affairs International, Incorporated We consent to the incorporation by reference in the registration statement on Form S-3 of Magellan Health Services, Inc. of our report dated February 7, 1997, except as to note 10 which is as of February 27, 1997, with respect to the consolidated balance sheets of Human Affairs International, Incorporated and subsidiaries as of December 31, 1996 and 1995, and the related consolidated statements of income, stockholder's equity, and cash flows for the years then ended, which report appears in the Form 8-K of Magellan Health Services, Inc. dated December 17, 1997 and to the reference to our firm under the heading "Experts" in the prospectus. /s/ KPMG PEAT MARWICK LLP --------------------------------------- KPMG Peat Marwick LLP Salt Lake City, Utah April 16, 1997