Nelson Engineering Co. is a Phoenix-based engineering firm specialising in mission-critical facilities, infrastructure and operations. They provide mechanical, electrical, plumbing, fire protection, civil, structural and architecture services, alongside specialist offerings in reliability engineering, commissioning, sustainability, power infrastructure modernisation, and facility condition assessments. The company holds a contract seat with the US Missile Defense Agency and works with federal, defence and private sector clients on complex projects including aerospace facilities, command centres and research installations. They are best suited to receive referrals for large-scale, technically demanding projects requiring expertise in mission-critical or federally regulated facilities.