Document:

EXHIBIT 10.90

 Exhibit 10.90 
 May 16, 2008 
 Mr. James Reagan 
 Deltek,
Inc. 
 13880 Dulles Corner Lane 
 Herndon, VA 20171 

Dear Jim: 
 Reference is made to (i) the
Shareholders’ Agreement, dated as of April 22, 2005 (as it may be amended from time to time, the “Shareholders’ Agreement”), by and among Deltek, Inc., a Delaware corporation (formerly Deltek Systems, Inc., a Virginia
corporation) (the “Company”), the shareholders of the Company listed on the signature pages thereto and, with respect to Sections 3.3 and 3.4 thereof, New Mountain Partners II, L.P., New Mountain Affiliated Investors II, L.P. and
Allegheny New Mountain Partners, L.P. (collectively, the “NMP Entities”) and (ii) the Joinder Agreement dated as of December 15, 2005 (the “Joinder Agreement”) by and among you, the Company and the NMP
Entities, pursuant to which you became a party to the Shareholders’ Agreement. 
 This letter is to confirm our agreement as follows:

 1. Effective November 16, 2008, and conditioned upon your (i) entering into the separation agreement and release letter (the
“Separation and Release”) attached as Attachment A and the Waiver and Release of Claims (the “Waiver and Release”) attached as Attachment B and (ii) re-executing the Waiver and Release on your last day of employment with the
Company, as provided in the Separation and Release, and not revoking the Separation and Release or the Waiver and Release, the Company and the NMP Entities each hereby waives any further compliance by you with, and agrees that you shall have no
further obligations to any of them under, Sections 3.1, 3.3, 3.4, 3.5 and 3.6 of the Shareholders’ Agreement from and after November 16, 2008. 
 2. In consideration of the foregoing, you hereby waive any further compliance by the Company and the NMP Entities with, and agree that the Company and the NMP Entities shall have no further obligations to you under,
Sections 3.1, 3.3, 3.4, 3.5 and 3.6 of the Shareholders’ Agreement from and after November 16, 2008. 
 3. In all other respects,
the Shareholders’ Agreement and the Joinder Agreement shall remain in full force and effect in accordance with their respective terms. 
 If the foregoing corresponds to your understanding of our agreement, please sign this letter and the enclosed copy in the space provided and return one copy to us. 

					
	Very truly yours,
	
	DELTEK, INC.
		
	By:	 	 /s/ Kevin T. Parker

	Name:	 	Kevin Parker
	Title:	 	President and Chief Executive Officer
	
	NEW MOUNTAIN PARTNERS II, L.P.
		
	By:	 	New Mountain Investments II, L.L.C., its general partner
			
		 	By:	 	 /s/ Steven B. Klinsky

		 	Name:	 	Steven B. Klinsky
		 	Title:	 	Managing Member
	
	NEW MOUNTAIN AFFILIATED INVESTORS II, L.P.
		
	By:	 	New Mountain Investments II, L.L.C., its general partner
			
		 	By:	 	 /s/ Steven B. Klinsky

		 	Name:	 	Steven B. Klinsky
		 	Title:	 	Managing Member
	
	ALLEGHENY NEW MOUNTAIN PARTNERS, L.P.
		
	By:	 	New Mountain Investments II, L.L.C., its general partner
			
		 	By:	 	 /s/ Steven B. Klinsky

		 	Name:	 	Steven B. Klinsky
		 	Title:	 	Managing Member

 ACKNOWLEDGED AND AGREED TO 
 AS OF THE DATE FIRST WRITTEN ABOVE 
  

	
	 /s/ James Reagan

	James ReaganSeperation Agreement

 Exhibit 10.1 
 EMPLOYMENT SEPARATION AGREEMENT 
 Entire Agreement: 
 This Agreement covers all understandings between Eric Obeck (“EMPLOYEE”) and SendTec, Inc. (“EMPLOYER”), relating to EMPLOYEE’s
employment and separation from employment with EMPLOYER. (For the purposes of this waiver and release, SendTec, Inc. should be understood to mean not only SendTec, Inc. itself, but also any or all current or former affiliated companies and
corporations, parent corporations, partnerships, divisions and subsidiaries, and the current and former officers, directors, shareholders, employees, agents, insurers, attorneys, successors and assigns of EMPLOYER). 
 Separation: 
 EMPLOYEE’s separation from
employment is effective April 16, 2008 (the “Separation Date”). Following the Separation Date, the following shall be paid to Employee pursuant to Company policy: 
 a) Any vested amounts due to EMPLOYEE under deferred compensation plans (such as pension, retirement or profit sharing plans) will be paid according to
the terms of the plans; 
 b) Any paid time off (PTO) pay which EMPLOYEE has earned but not used will be paid to EMPLOYEE in EMPLOYEE’S
final pay check; 
 c) Any properly reimbursable expenses submitted by EMPLOYEE prior to the Separation Date or within one week thereafter,
shall be paid in accordance with Company policy. 
 d) EMPLOYEE shall be entitled to health insurance continuation benefits under COBRA at his
own election and sole expense. 
 e) Any commissions earned, but unpaid at the Separation Date, will be paid. 
 After the Separation Date, the only other payments or other things of value which EMPLOYEE will be entitled to receive from EMPLOYER are those set forth
in this Agreement. This Agreement supersedes the Employment Agreement dated October 28, 2005, with the exception that Paragraph 7 and the restrictive covenants and enforcement procedures in Paragraphs 11, 12 and 15 of the Employment
Agreement shall remain in effect according to their terms. EMPLOYEE hereby reaffirms his intent to comply with such restrictions in full. Employee agrees that if he violates said restrictions, the Company may discontinue any further payments under
this release, and may in addition seek an injunction restraining any further violations of the Employment Agreement. 
  

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 No other agreement between EMPLOYEE and EMPLOYER relating to EMPLOYEE’S employment will have any
effect unless it is in writing and is signed and dated by both parties after the date that this Agreement is signed. 
 Mutual Promises: 

In exchange for the promises which EMPLOYEE makes in this Agreement below, EMPLOYER agrees to provide to EMPLOYEE the additional benefits which are
described below. In exchange for the promises which EMPLOYER makes in this Agreement, EMPLOYEE agrees to certain confidentiality and post-employment obligations to EMPLOYER. These obligations are explained below. 
 Additional Benefits to Employee: 
 EMPLOYER shall pay
EMPLOYEE his salary through the Separation Date, and for a period extending to July 15, 2008, in regular intervals in accordance with the Company’s payroll practices in effect from time to time, less applicable withholding. Further, the
EMPLOYER will make the EMPLOYEE’s Cobra payments for a period extending to July 15, 2008. EMPLOYER further agrees to permit the EMPLOYEE to keep the cell phone and laptop he currently has, however, the EMPLOYEE will be solely responsible
for any and all payments associated with maintenance of the cell phone and laptop, including but not limited to any service carrier or provider for the cell phone and the laptop. Notwithstanding the foregoing, the EMPLOYER will pay for the cost of
the service provider of the cell phone and computer wireless card for the EMPLOYEE only through July 15, 2008. 
 Return of Property: 

EMPLOYEE agrees to return to EMPLOYER, and to not at any time thereafter, for any purpose or reason, further use, publish or keep at the time of his
termination, any Company property and any and all documents related to the Company. Such property includes the original and any copy of company-issued keys, key cards, business documents, company credit cards, pagers, client lists, files, computer
software, printouts, computer CD-ROMs, zip drives and their contents, and any other computerized information, as well as system access codes or passwords, plans, records, drawings, materials, advertisements, brochures, equipment, manuals, notebooks,
and any other record, papers, documents and copies thereof relating to the Company and its business. It is specifically agreed that any documents, card files, notebooks, programs, etc. containing customer information and confidential information
given to the Company by the Customers, including Customer search-engine passwords, are the property of the Company regardless of by whom they were compiled. 
 EMPLOYEE further agrees that after his termination, unless authorized in writing by the Company, he will not access or attempt to access any of EMPLOYER’S or EMPLOYER’S Clients’ systems, including, but
not limited to, secure websites, secured client systems, databases, EMPLOYER and Client networks, file systems, email systems, VPN systems, telephone and voice mail systems or any proprietary or operating systems of or for EMPLOYER or
EMPLOYER’S Clients’ businesses. 
  

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 Non-Disparagement: 
 EMPLOYEE agrees not to make or publish any statement (orally or in writing) or instigate, assist or participate in the making or publication of any statement which would libel, slander, or disparage or expose to
hatred, contempt or ridicule EMPLOYER or its products, services, affairs or operations. EMPLOYER agrees not to make or publish any statement (orally or in writing) or instigate, assist or participate in the making or publication of any statement
which would libel, slander, or disparage or expose to hatred, contempt or ridicule EMPLOYEE or his services. 
 Covenant to Cooperate: 
 EMPLOYEE hereby acknowledges that a partial consideration for the benefits EMPLOYEE will receive pursuant to this Agreement and an inducement for EMPLOYER
to enter into this Agreement is EMPLOYEE’S agreement to cooperate with the Company following EMPLOYEE’S separation through July 15, 2008 as follows: 
  

	 	(A)	If reasonably requested by the Company, EMPLOYEE will cooperate with Company in the defense or prosecution of one or more existing or future court actions, governmental
investigations, arbitrations, mediations or other legal or equitable proceedings which involve Company or any of its current or former employees, officers or directors. This cooperation may include, but shall not be limited to, the availability to
provide testimony in deposition, affidavit, trial, mediation or arbitration, as well as preparation for that testimony. EMPLOYEE acknowledges that EMPLOYEE shall be available at Company’s reasonable request for any meetings or conferences
Company deems necessary in preparation for the defense or prosecution of any such legal proceedings. If Company requests EMPLOYEE to travel or travel is otherwise required in conjunction with EMPLOYEE’S providing assistance to Company pursuant
to this provision, Company will reimburse or pay for EMPLOYEE’S necessary and reasonable travel expenses. 

  

	 	(B)	If reasonably requested by the Company, EMPLOYEE will provide contact information, project status, contract status information about works in progress, financial information, and
any other information related to EMPLOYEE’S job duties and responsibilities. 

  

	 	(C)	EMPLOYEE will, for a period of ten weeks from the date of his termination, inform EMPLOYER of any employment he has accepted, including the name of new employer and the position for
which he as been employed. 

  

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 Voluntary and Knowing Agreement: 
 EMPLOYEE hereby warrants that EMPLOYEE has had adequate time to read and understand the terms and provisions of this Agreement. EMPLOYEE further warrants that no promise or inducement has been offered or made except
as set forth or referenced herein. 
 YOU ARE ADVISED TO CONSULT AN ATTORNEY BEFORE SIGNING THIS AGREEMENT. 
  

					
			
	/s/ Eric Obeck	 	 	 	4/16/08
	EMPLOYEE	 		 	DATE
		 		 	
			
	/s/ Paul Soltoff	 		 	4/16/08
	FOR THE EMPLOYER	 		 	DATE

  

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