Tammy Diamond — Chief Operating Officer, J National Tammy Diamond is the Chief Operating Officer of J National, a multi-market commercial service organization specializing in emergency response, mechanical services, and large-scale property support across Texas. With over 25 years of industry experience, she leads operations serving multifamily, commercial, and institutional clients who require reliability, rapid response, and disciplined execution. Tammy oversees large service teams, dispatch operations, subcontractor compliance, financial controls, and technology systems that support complex property portfolios and time-sensitive emergencies. Her work focuses on helping property owners reduce operational risk, protect asset value, and maintain continuity during critical service events. Known for building structured, scalable service organizations in an industry often driven by improvisation, Tammy brings a rare operator’s perspective on what separates dependable partners from high-risk vendors. She regularly advises ownership groups and management firms on emergency preparedness, vendor evaluation, and operational best practices. Tammy is also a licensed real estate professional and actively collaborates with property managers, developers, and asset managers to support long-term property performance and tenant satisfaction.