Anthony (Tony) Chakalis is an engineering technician in the National Fire Research Laboratory (NFRL) of the Fire Research Division (FRD) of the Engineering Laboratory (EL) at the National Institute of Standards and Technology (NIST). Mr. Chakalis joined NIST in April 2007 and has provided technical support for a wide range of fire experiments in the National Fire research Laboratory (NFRL). His duties at the NFRL include installing measurement instrumentation, fabrication of experimental specimens and fixtures, and suppression of large fire experiments. He is a qualified operator of the NFRL large fire heat release rate calorimeter data acquisition and control system, and the NFRL MTS hydraulic system. He maintains and operates the NFRL exhaust gas emissions control system. He has assisted in more than 15 off site fire experiments and completed several deployments to assist with the investigation of the Champlain Towers South collapse.