Dr. Bala Muralikrishnan has a Ph.D. in mechanical engineering from the University of North Carolina at Charlotte. He is a mechanical engineer in the Dimensional Metrology Group in the Sensor Science Division of the Physical Measurement Laboratory (PML) at the National Institute of Standards and Technology (NIST). He served as the chair of the ASME B89.4.19 committee involved in the revision of the laser tracker standard and as the technical lead for the ASTM E3125-17 standards effort for terrestrial laser scanners. Dr. Muralikrishnan is on the editorial board of Surface Topography and Remote Sensing. He also served on the editorial board of Precision Engineering and as a guest editor for a special issue on terrestrial laser scanners for Sensors. His research is focused on modeling and detecting errors in advanced dimensional measurement systems such as laser trackers, terrestrial laser scanners, and X-ray CT systems.