Since Mark had experience in surveying, they were invited to participate in the construction. They worked on the project in Georgetown until its completion in June 1981.
डेनिस आणि कॅथीला १९८९ साली, यहोवाच्या साक्षीदारांच्या बांधकाम कार्यात कायमसाठी सेवा करण्यासाठी आमंत्रित करण्यात आले.