Exhibit 10.70 Richard F. Syron 394 Hammond Street Chestnut Hill, Massachusetts 02467 December 12, 2003 Board of Directors Thermo Electron Corporation 81 Wyman Street Waltham, Massachusetts 02451 Re: Resignation Ladies and Gentlemen: Effective as of December 31, 2003, I hereby resign my position as Executive Chairman and member of the Board of Directors of Thermo Electron Corporation ("Thermo") and from each and every other office or position I now have or hold in Thermo and any and all affiliates of Thermo. Our agreement regarding my resignation is governed by my Amended and Restated Employment Agreement dated November 21, 2002 (the "Agreement") except as otherwise provided by this letter. First, Thermo waives the provision under the Agreement that requires 30 days prior written notice of my resignation. Second, Thermo agrees, as such amount is finally determined by the Board of Directors, to pay my annual cash incentive award for 2003 at the same time that other senior executives are paid their annual cash incentive awards as if I had remained employed by Thermo through the date of such payment. Third, by way of clarification of certain provisions of the Agreement, (a) my salary and all employee benefits shall, except as expressly set forth herein, be discontinued as of the close of business on December 31, 2003, (b) all vested stock options (as set forth on Schedule A hereto) shall remain exercisable through March 30, 2004, and (c) all vested stock units (as set forth on Schedule A hereto) shall be paid out as soon as practicable after December 31, 2003. Fourth, all other provisions of the Agreement that survive the termination of my employment, such as the non-compete provision, shall survive in accordance with their terms. Sincerely, /s/ Richard F. Syron - ------------------------------- Richard F. Syron Agreed and accepted this 12th day of December, 2003 THERMO ELECTRON CORPORATION By: Seth H. Hoogasian ----------------------- Vice President, General Counsel and Secretary Schedule A Restricted Stock that are Forfeited Upon Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Stock Cash Paid Number Grant Date of Shares - ----------------- --------------- --------------- -------------- ----------- 6/1/2002 6/1/2005 TMO $0.00 5,461 - ----------------- --------------- --------------- -------------- ----------- 6/1/2001 6/1/2004 TMO $0.00 3,560 - ----------------- --------------- --------------- -------------- ----------- Kadant $0.00 218 - ----------------- --------------- --------------- -------------- ----------- Viasys $0.00 520 - ----------------- --------------- --------------- -------------- ----------- Restricted Stock that Vests Upon Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Stock Cash Paid Number Grant Date of Shares - ----------------- --------------- --------------- -------------- ----------- 6/1/2002 6/1/2005 TMO $0.00 5,462 - ----------------- --------------- --------------- -------------- ----------- 6/1/2001 6/1/2004 TMO $0.00 3,560 - ----------------- --------------- --------------- -------------- ----------- Kadant $0.00 218 - ----------------- --------------- --------------- -------------- ----------- Viasys $0.00 520 - ----------------- --------------- --------------- -------------- ----------- Restricted Stock Units that are Forfeited Upon Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Stock Cash Paid Number Grant Date of Shares - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2004 TMO $0.00 33,333 - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2005 TMO $0.00 33,334 - ----------------- --------------- --------------- -------------- ----------- Vested Stock Units to be Paid Following Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Stock Cash Paid Number Grant Date of Shares - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 TMO $0.00 111,845 - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2003 TMO $0.00 33,333 - ----------------- --------------- --------------- -------------- ----------- Unvested TMO Options that are Forfeited Upon Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Type Exercise Number Grant Date Price of Shares - ----------------- --------------- --------------- -------------- ----------- 9/24/1997 various n/a $33.88 4,652 - ----------------- --------------- --------------- -------------- ----------- 3/14/2001 3/14/2004 n/a $22.47 100,790 - ----------------- --------------- --------------- -------------- ----------- 3/15/2002 3/15/2004 n/a $20.27 43,333 - ----------------- --------------- --------------- -------------- ----------- 3/15/2002 3/15/2005 n/a $20.27 43,334 - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2005 n/a $19.67 173,316 - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2006 n/a $19.67 173,316 - ----------------- --------------- --------------- -------------- ----------- 11/21/2002 11/21/2007 n/a $19.67 173,368 - ----------------- --------------- --------------- -------------- ----------- TMO Options that Vest Upon Termination, and Expire 90 Days Following Termination - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Type Exercise Number Grant Date Price of Shares - ----------------- --------------- --------------- -------------- ----------- 3/15/2002 3/15/2004 NQO $20.27 43,333 - ----------------- --------------- --------------- -------------- ----------- 3/15/2002 3/15/2005 NQO $20.27 43,334 - ----------------- --------------- --------------- -------------- ----------- Vested TMO Options that Expire 90 Days Following Termination * - -------------------------------------------------------------------------------- --------------- --------------- -------------- ----------- Date of Vesting Type Exercise Number Grant Date Price of Shares - ----------------- --------------- --------------- -------------- ----------- 9/24/1997 various n/a $33.88 6,976 - ----------------- --------------- --------------- -------------- ----------- NQO $16.43 977,055 - ----------------- --------------- --------------- -------------- ----------- NQO $18.27 348,886 - ----------------- --------------- --------------- -------------- ----------- 3/14/2001 3/14/2002 NQO $22.47 100,789 - ----------------- --------------- --------------- -------------- ----------- 3/14/2001 3/14/2003 NQO $22.47 100,789 - ----------------- --------------- --------------- -------------- ----------- 3/15/2002 3/15/2003 NQO $20.27 86,666 - ----------------- --------------- --------------- -------------- -----------