Document:

EMPLOYMENT AGREEMENT / ROLAND SACHERS

 Exhibit 4.23 
  
 EMPLOYMENT AGREEMENT 
  
 by and between 
  
 QIAGEN GmbH, 
 Max-Volmer-Str. 4, 40724 Hilden 
  
 - hereinafter QIAGEN - 
  
 and 
  
 Mr. Roland Sackers 
  
 - hereinafter Employee - 
  
 Article 1 
 Commencement of the
Employment Relationship 
  

	(1)	 	The Employee shall commence his activities on September 30, 1999. 

  

	(2)	 	The initial six months shall be deemed as a probationary period. During said probationary period, one month’s notice of termination may be given by either party at the end of
any month. 

  
 Article 2 
 Job Description 
  

	(1)	 	The Employee shall assume the responsibilities of a Vice President, Finance, Europe. He shall perform all tasks in conjunction with the aforementioned activities.

  

	(2)	 	The Employee shall report to Mr. Peer Schatz. 

  

	(3)	 	The Company reserves the right to assign to the Employee a different field of tasks that corresponds to his education and his abilities with his remuneration remaining unchanged.

  

	(4)	 	The right of termination due to a change of contract shall remain unaffected. 

 Article 3 
 Work Deployment 
  

	(1)	 	The Employee’s weekly work period shall comprise 39 hours. 

  

	(2)	 	The Employee agrees to perform the tasks assigned to him during his activities conscientiously and to be best of his abilities, and to safeguard QIAGEN’s interests in every
respect. The Employee agrees in particular to comply with all legal and corporate safety regulations. 

  

	(3)	 	The Employee shall be ready and willing to work overtime and extra hours within the framework of operational requirements. 

  
 Article 4 
 Ancillary Activities and Lectures 
  

	(1)	 	Any independent or task-related ancillary activity by the Employee shall require the prior written approval of QIAGEN. QIAGEN shall grant such approval if the ancillary activity
does not violate QIAGEN’s interests. 

  

	(2)	 	Lectures and publications shall also require approval of QIAGEN if QIAGEN’s interests are touched. The subject and relevant content shall be reviewed by a Superior for his
approval. 

  
 Article 5 
 Salary 
  

	(1)	 	The Employee shall receive a gross monthly salary of DM 11,875. Beginning in January 2001, the Employee shall receive a gross monthly salary of DM 14,615. In addition, beginning in
the year 2000, the Employee shall receive an annual bonus in the amount of DM 20,000. 

  

	(2)	 	In addition, the Employee shall receive benefits in the form of contributions to an Employee stock investment plan in the gross amount of DM 52.00 per month.

	(3)	 	The salary including any supplemental bonuses, etc. shall be transferred in non-cash form at the end of each month to an account to be named by the Employee.

  

	(5)	 	The aforementioned base pay explicitly includes any remuneration for extra or overtime work. 

  
 Article 6 
 Vacation Pay 
  

	(1)	 	The Employee shall receive voluntary vacation pay together with his June salary in the amount of DM 35.00 per vacation day as set forth in Article 12; such pay shall be revocable at
any time. In the entry year, the Employee vacation pay shall be prorated. 

  
 Article 7 
 Christmas Gratuity 
  

	(1)	 	Together with the November salary, the Employee shall receive a Christmas bonus in the amount of one fixed salary pursuant to Article 5 (1). In the entry year, the Christmas bonus
shall be prorated. 

  

	(2)	 	No claim to the Christmas gratuity shall exist if the employment agreement is terminated by either party at the time of disbursement or as per December 31 of any year, or if it ends
pursuant to an agreement to terminate the contract. However, this shall not apply if the termination occurs for personal reasons that the Employee does not need to justify. The same shall apply to any agreement to terminate the contract.

  

	(3)	 	The Employee shall repay the Christmas gratuity if he leaves of his own volition, through extraordinary termination by QIAGEN or for reasons of misconduct by March 31 of the
calendar year following the disbursement or in the event that the Christmas gratuity amounts to more than one month’s remuneration, if he leaves by June 30 of the calendar year following the disbursement. 

  

	(4)	 	The repayment obligation set forth above shall be in force also in the event that the employment agreement is terminated within the aforementioned period by way of an agreement to
terminate the contract and if the agreement to terminate the contract is in lieu of an extraordinary termination or termination based on misconduct and issued within the prescribed time limits or if it is due to a termination request on the part of
the Employee. 

 Article 8 
 Salary Pledge and/or Assignment 
  

	(1)	 	The Employee may pledge or assign his remuneration claims to any third parties only with the prior approval of QIAGEN. 

  

	(2)	 	The Employee shall bear the actual costs of the pledge, if granted, in an amount not less than DM 10.00 per payment to the pledge creditor. 

  
 Article 9 
 Insurance 
  

	(1)	 	QIAGEN shall include the Employee in the existing group accident insurance. The insurance amount in the event of death shall be DM 50,000.00, in the event of disability, DM
200,000.00. 

  

	(2)	 	Beneficiary from the insurance shall be the Employee in the event of disability; in the event of death, the person designated by the Employee. If no person has been designated, the
beneficiary shall be the spouse, otherwise the other legal heirs. 

  
 Article 10 
 Secrecy Obligation 
  

	(1)	 	The Employee agrees to maintain secrecy on all confidential matters and activities, in particular on business and operational secrets, that he gains knowledge of within the
framework of his activities during his employment as well as after his leaving the employment relationship. The secrecy obligation shall also apply to the salary agreement as concluded. 

  

	(2)	 	The aforementioned secrecy obligation shall not only apply vis-à-vis any external third parties but also vis-à-vis other Employees of QIAGEN to the extent that the
latter are not authorized to receive such information by way of their official activities. 

  

	(3)	 	The provisions of the Data Protection Act must be complied with. 

 Article 11 
 Obligation to Provide Information 
  
 The
Employee will inform his superiors and the management also, if necessary, about all activities in his area of responsibility, to the extent that this knowledge is of importance to superiors, e.g. in order to avoid damages or carry out improvements.
The above applies also to observations and information outside of his own direct area of responsibility. 
  
 Article 12 
 Vacation 
  

	(1)	 	QIAGEN shall grant the Employee 6 days of vacation in 1999. The Employee shall receive 26 days of vacation in the year 2000. 

  

	(2)	 	The vacation claim shall increase by one workday for each full year of service, up to a maximum of 30 workdays. 

  

	(3)	 	The vacation shall be coordinated with his superior and the [other] Employees. 

  

	(4)	 	The Employee shall provide QIAGEN with his vacation address. 

  

	(5)	 	Any vacation not taken shall be forfeited on March 31 of the subsequent year. 

  

	(6)	 	The following provision applies to completion of the certified professional accounting examination (anticipated by July 31, 2002). 

  
 The Employee shall be entitled to receive unpaid vacation consisting of 35
consecutive workdays in addition to his vacation not taken for continuing education and advanced training. The vacation not taken and unpaid vacation shall be so granted that prior to the first examination week, not less than 55 consecutive workdays
(including examination week) will be reserved. The remaining time, approximately 20 workdays, shall be granted, when possible in a consecutive fashion, at the discretion of and in consultation with superiors. For the oral examination, the Employee
shall be granted the opportunity for a vacation consisting of 10 consecutive workdays prior to the first examination and the same conditions for the examination days as well. 
  
 The Employee shall be required to arrange these dates with superiors if there exists the possibility of choosing between
multiple examination dates. 

 Article 14 
 Inability to Work 
  

	(1)	 	The Employee is required to notify QIAGEN without delay of any inability to work, in particular of any disability and its anticipated duration. Upon request, the reasons for the
inability to work shall be disclosed. In the event of any deadlines, the Employee shall point out any work requiring preferential attention. 

  

	(2)	 	If the inability to work lasts longer than 3 calendar days, the Employee shall submit a doctor’s attestation of the existence of the inability to work as well as its
anticipated duration not later than on the following workday. 

  

	(3)	 	If the Employee is prevented from performing his duties because of disability due to illness that is not his fault, he shall not lose his claim to compensation for the period of his
inability to work up to a period of 6 weeks. 

  

	(4)	 	In the event of approval of a recuperative, rehabilitative or other health measure, the employee shall present an attestation without delay regarding the approval and duration of
treatment as well as any other relevant information. 

  
 Article 14 
 Assignment 
  

	(1)	 	If, based on legal prescriptions, the Employee can claim damages from any third party due to loss of wages incurred by him because of his inability to work, such claim shall be
transferred to QIAGEN to the extent that QIAGEN has continued to pay the Employee’s remuneration as well as any contributions to the social securities that QIAGEN is required to bear. 

  

	(2)	 	The Employee shall provide QIAGEN without delay with any information necessary for the assertion of such damage claims. 

  
 Article 15 
 Duration of the Employment Agreement 
  

	(1)	 	The employment agreement is concluded for an indeterminate time period. 

  

	(2)	 	The employment agreement may be terminated at the end of any quarter, with three months notice. The period for providing notice shall be extended in accordance with the legal
provisions. Any extension of the period of notice for the Employer shall be matched in equal time by an extension of the period of notice on the part of the Employee. 

	(3)	 	Any termination shall have to be given in writing. Transmission of a signed fax shall be deemed to be in compliance with the written requirement. 

  

	(4)	 	QIAGEN shall have the right to release the Employee after notice has been given, honoring any residual vacation claims. 

  

	(5)	 	The employment agreement shall end, without any notice of termination being required, with the expiration of the month in which the Employee receives a disability pension. In the
same manner, the employment agreement shall end with the expiration of the month in which the Employee receives an old-age pension. At the latest, the employment agreement shall end with the expiration of the month in which the Employee reaches age
65. 

  

	(6)	 	The right to terminate without notice shall remain unaffected. Any termination without notice shall at the same time be deemed a precautionary termination given within the legally
prescribed time limits. 

  
 Article 16

 Contractual Penalty 
  
 If in violation of the agreement, the Employee does not commence his activities, terminates them prematurely, is terminated without notice, or violates the secrecy
obligations set forth in Article 12, he shall have to pay a contractual penalty in the amount of one gross monthly salary pursuant to Article 5. QIAGEN shall have the right to assert further damages. 
  
 Article 17 
 Return of Business Records 
  

	(1)	 	All business and work records regardless of their nature, including data-processing programs and the like, shall remain the property of the Company. Removal from the business
premises shall be permitted only with the approval of superiors. 

  

	(2)	 	The business records, and likewise any copies, duplicates, etc., must be returned at any time upon request, or at the time of termination of the employment relationship.

  

	(3)	 	The Employee shall have no right of retention. 

 Article 19 
 Expiration Date 
  
 All claims arising from
this employment relationship shall be forfeited unless they are asserted in writing not later than six months following their coming into being and, in the event they are refused by the other party, unless they are asserted in court within two
months after communication of the refusal. 
  
 Article 20

 Final Provisions 
  

	(1)	 	The parties have concluded no other agreements with the exception of the ones set forth above. 

  

	(2)	 	Any future amendments of and/or supplements to the agreement shall be in writing in order to acquire legal effect. This shall apply to the preceding sentence as well.

  

	(3)	 	If any provision of this contract should be or become ineffective, the legal validity of the remaining provisions shall not be affected thereby. In lieu of the invalid provision,
the parties agree to concur on a provision that comes the closest, in economic terms, to the invalid one. The same shall apply in the event of a loophole, or if any individual provisions should be or become impracticable. 

 

					
	 Hilden, September 30, 1999
	  	 	 	 
			
	 QIAGEN GmbH
	  	 	 	 Employee

			
	 By procuration
	  	 In representation of
	 	 
			
	 /s/ DR. METIN COLPAN

	  	 Peer M. Schatz
	 	 /s/ ROLAND SACKERS

	 Dr. Metin Colpan
	  	 	 	 Roland SackersEMPLOYMENT AGREEMENT / ROLAND SACKERS

 Exhibit 4.24 
  
 EMPLOYMENT AGREEMENT 
  
 by and between 
  
 QIAGEN N.V., 
 Venlo, Netherlands 
  
 - hereinafter QIAGEN - 
  
 and 
  
 Mr. Roland Sackers 
  
 - hereinafter Employee - 
  
 Article 1 
 Commencement of the
Employment Relationship 
  

	(1)	 	The Employee shall commence his activities on October 1, 1999. 

  
 Article 2 
 Job Description

  

	(1)	 	The Employee shall assume the responsibilities of a Special Advisor and Finance Expert. He shall perform all tasks in conjunction with the aforementioned activities.

  

	(2)	 	The Employee shall report to Mr. Peer Schatz. 

  

	(3)	 	The Company reserves the right to assign to the Employee a different field of tasks that corresponds to his education and his abilities with his remuneration remaining unchanged.

  

	(4)	 	The right of termination due to a change of contract shall remain unaffected. 

 Article 3 
 Work Deployment 
  

	(1)	 	The Employee’s weekly work period shall comprise 6 hours. 

  

	(2)	 	The Employee agrees to perform the tasks assigned to him during his activities conscientiously and to be best of his abilities, and to safeguard QIAGEN N.V.’s interests in
every respect. The Employee agrees in particular to comply with all legal and corporate safety regulations. 

  

	(3)	 	The Employee shall be ready and willing to work overtime and extra hours within the framework of operational requirements. 

  
 Article 4 
 Ancillary Activities and Lectures 
  

	(1)	 	Any independent or task-related ancillary activity by the Employee shall require the prior written approval of QIAGEN N.V. QIAGEN N.V. shall grant such approval if the ancillary
activity does not violate QIAGEN N.V.’s interests. 

  
 Article 5 
 Salary 
  

	(1)	 	The Employee shall receive a gross monthly salary of DM 2,179. 

  

	(2)	 	The salary including any supplemental bonuses, etc. shall be transferred in non-cash form at the end of each month to an account to be named by the Employee.

  

	(3)	 	The Employee shall not receive participation in a pension plan. 

  
 Article 6 
 Vacation Pay

  

	(1)	 	The Employee shall receive 4 vacation days per calendar year. If the employment relationship does not extend through a calendar year, the vacation will be shortened proportionately
by each calendar month. The Employee shall receive vacation pay in the amount of 8% of the previous year’s gross monthly salary together with his July salary. If the Employee leaves during the course of the calendar year, the vacation pay shall
be prorated. 

 Article 7 
 Salary Pledge and/or Assignment 
  

	(1)	 	The Employee may pledge or assign his remuneration claims to any third parties only with the prior approval of QIAGEN N.V. 

  

	(2)	 	The Employee shall bear the actual costs of the pledge, if granted, in an amount not less than DM 10.00 per payment to the pledge creditor. 

  
 Article 8 
 Employee Inventions 
  
 The law on employee inventions shall be applicable, as well as the guidelines issued thereto on the remuneration of employee inventions in private service. 
  
 Article 9 
 Secrecy Obligation 
  

	(1)	 	The Employee agrees to maintain secrecy on all confidential matters and activities, in particular on business and operational secrets, that he gains knowledge of within the
framework of his activities during his employment as well as after his leaving the employment relationship. The secrecy obligation shall also apply to the salary agreement as concluded. 

  

	(2)	 	The aforementioned secrecy obligation shall not only apply vis-à-vis any external third parties but also vis-à-vis other Employees of QIAGEN to the extent that the
latter are not authorized to receive such information by way of their official activities. 

  
 Article 11 [ sic] 
 Obligation to Provide Information 
  
 The Employee will inform his superiors and the management also, if necessary, about all
activities in his area of responsibility, to the extent that this knowledge is of importance to superiors, e.g. in order to avoid damages or carry out improvements. The above applies also to observations and information outside of his own direct
area of responsibility. 

 Article 12 
 Inability to Work 
  

	(1)	 	The Employee is required to notify QIAGEN without delay of any inability to work, in particular of any disability and its anticipated duration. Upon request, the reasons for the
inability to work shall be disclosed. In the event of any deadlines, the Employee shall point out any work requiring preferential attention. 

  

	(2)	 	If the inability to work lasts longer than 3 calendar days, the Employee shall submit a doctor’s attestation of the existence of the inability to work as well as its
anticipated duration not later than on the following workday. If the inability to work lasts longer than indicated by the doctor’s attestation, the Employee is obligated to submit a new attestation without delay. 

  

	(3)	 	If the Employee is prevented from performing his duties because of disability due to illness that is not his fault, he shall not lose his claim to compensation for the period of his
inability to work up to a period of 6 weeks. 

  
 Article 13 
 Assignment 
  

	(1)	 	If, based on legal prescriptions, the Employee can claim damages from any third party due to loss of wages incurred by him because of his inability to work, such claim shall be
transferred to QIAGEN N.V. to the extent that QIAGEN N.V. has continued to pay the Employee’s remuneration as well as any contributions to the social securities that QIAGEN N.V. is required to bear. 

  

	(2)	 	The Employee shall provide QIAGEN without delay with any information necessary for the assertion of such damage claims. 

  
 Article 14 
 Duration of the Employment Agreement 
  

	(1)	 	The employment agreement is concluded for an indeterminate time period. 

  

	(2)	 	The employment agreement may be terminated at the end of any month, with one month notice. The period for providing notice shall be extended in accordance with the legal provisions.
Any extension of the period of notice for the Employer shall be matched in equal time by an extension of the period of notice on the part of the Employee. 

	(3)	 	Any termination shall have to be given in writing. Transmission of a signed fax shall be deemed to be in compliance with the written requirement. 

  

	(4)	 	QIAGEN N.V. shall have the right to release the Employee after notice has been given, honoring any residual vacation claims. 

  
 The employment agreement shall end with the expiration of the month in which
the Employee reaches age 65. 
  
 Article 15 
 Contractual Penalty 
  
 If in violation of the agreement, the Employee terminates his activities prematurely, is terminated without notice, or violates the secrecy obligations set forth in
Article 9, he shall have to pay a contractual penalty in the amount of one gross monthly salary pursuant to Article 5. QIAGEN shall have the right to assert further damages. 
  
 Article 16 
 Return of Business Records 
  

	(1)	 	All business and work records regardless of their nature, including data-processing programs and the like, shall remain the property of the Company. Removal from the business
premises shall be permitted only with the approval of superiors. 

  

	(2)	 	The business records, and likewise any copies, duplicates, etc., must be returned at any time upon request, or at the time of termination of the employment relationship.

  

	(3)	 	The Employee shall have no right of retention. 

  
 Article 17 
 Other Agreements

  

	(1)	 	The legal court of jurisdiction for both parties shall be Düsseldorf. 

  

	(2)	 	This agreement is also legally binding according to the laws of Holland. 

 Article 18 
 Expiration Date 
  
 All claims arising from
this employment relationship shall be forfeited unless they are asserted in writing not later than six months following their coming into being and, in the event they are refused by the other party, unless they are asserted in court within two
months after communication of the refusal. 
  
 Article 19

 Final Provisions 
  

	(1)	 	The parties have concluded no other agreements with the exception of the ones set forth above. 

  

	(2)	 	Any future amendments of and/or supplements to the agreement shall be in writing in order to acquire legal effect. This shall apply to the preceding sentence as well.

  

	(3)	 	If any provision of this contract should be or become ineffective, the legal validity of the remaining provisions shall not be affected thereby. In lieu of the iN.V.alid provision,
the parties agree to concur on a provision that comes the closest, in economic terms, to the iN.V.alid one. The same shall apply in the event of a loophole, or if any individual provisions should be or become impracticable. 

 

			
	 Venlo, October 1, 1999
	  	 
		
	 QIAGEN N.V.
	  	Employee
		
	 /s/ PEER M. SCHATZ

	  	 /s/ ROLAND SACKERS

		
	 Peer M. Schatz
	  	Roland Sackers

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