Exhibit 16(a) POWER OF ATTORNEY We, the undersigned officers and Trustees of Eaton Vance Mutual Funds Trust, a Massachusetts business trust, do hereby severally constitute and appoint Alan R. Dynner, James B. Hawkes and Eric G. Woodbury, or any of them, to be true, sufficient and lawful attorneys, or attorney for each of us, to sign for each of us, in the name of each of us in the capacities indicated below, any and all amendments to the Registration Statement on Form N-14 filed by Eaton Vance Mutual Funds Trust with the Securities and Exchange Commission in respect of shares of beneficial interest, and other documents and papers relating thereto. IN WITNESS WHEREOF we have hereunto set our hands on the dates set opposite our respective signatures. Name Capacity Date ---- -------- ---- President, Principal Executive Officer and /s/ M. Dozier Gardner Trustee October 19, 1998 - -------------------------- M. Dozier Gardner Treasurer and Principal Financial and Accounting /s/ James L. O'Connor Officer October 19, 1998 - -------------------------- James L. O'Connor /s/ Donald R. Dwight Trustee October 19, 1998 - -------------------------- Donald R. Dwight Vice President /s/ James B. Hawkes and Trustee October 19, 1998 - -------------------------- James B. Hawkes /s/ Samuel L. Hayes, III Trustee October 19, 1998 - -------------------------- Samuel L. Hayes, III /s/ Norton H. Reamer Trustee October 19, 1998 - -------------------------- Norton H. Reamer /s/ John L. Thorndike Trustee October 19, 1998 - -------------------------- John L. Thorndike /s/ Jack L. Treynor Trustee October 19, 1998 - -------------------------- Jack L. Treynor