American Science & Engineering, Inc. (ASEI) develops and manufactures advanced X-ray detection systems and imaging technologies for security, customs, and industrial applications. The company offers cargo inspection systems, parcel and baggage scanners, trace detection devices for explosives and narcotics, and portable X-ray systems; it also provides related maintenance, training, and software services for threat detection. Headquartered in Nashua, New Hampshire, and founded in 1958, ASEI primarily serves government agencies, border control authorities, and commercial security operators across North America, Europe, and Asia. In recent years, the company was acquired by OSI Systems, Inc. in 2016 for approximately $385 million, marking a significant strategic shift as it integrated into OSI's security division and discontinued independent public trading under the ASEI ticker. Post-acquisition, ASEI has expanded its product portfolio through OSI-led innovations, including new generations of high-energy transmission X-ray systems and AI-enhanced image analysis tools launched in 2024. No major name changes, funding rounds, or reorganizations have been reported for ASEI in the last 1-2 years.