Richard Aull is president and principal engineer of Richard Aull Cooling Tower Consulting, LLC. He has been working in the cooling tower industry for over 40 years, with a specific interest in tower thermal design, performance rating, and analysis. Prior to starting his consulting business in 2017, he held technical positions within Brentwood Industries' cooling tower business unit, first as R&D manager and lastly as director of application engineering. Earlier in his career he held a variety of engineering positions within Research Cottrell's Hamon Cooling Tower Division and the Ecodyne Cooling Tower Services Group. Rich is active in the Cooling Technology Institute (CTI) and has published technical papers and conducted seminars on a variety of cooling tower topics.