American Science and Engineering, Inc. Names Robert G. Postle Vice President, Worldwide Marketing and Sales.

Business Editors/High-Tech Writers

BILLERICA, Mass.--(BUSINESS WIRE)--March 11, 2004

American Science and Engineering, Inc. (AMEX: ASE) (AS&E(R)), a leader in X-ray detection technology, announced today the appointment of Robert G. Postle to the position of Vice President, Worldwide Marketing and Sales. Mr. Postle, 49, is responsible for leading the marketing and sales organization to expand sales channels, increase market penetration and grow revenues; enhance customer relationships; and contribute to overall company profitability.

"I am pleased to announce that Robert Postle has joined AS&E to lead our marketing and sales group," said Anthony Fabiano, President and CEO. "Bob brings more than 25 years of leadership experience in high-tech capital equipment markets. Throughout his career, he has developed an impressive track record of increasing revenue and customer satisfaction by building and leading customer-focused sales, marketing and support organizations. Specifically, as VP of Sales at PRI Automation, he reorganized the sales and marketing organizations to grow revenue from $36 million to more than $300 million over a five-year period. We were clearly impressed by this accomplishment, and we believe that Bob has the right combination of experience, skills and enthusiasm to perform in this key role. We look forward to his contributions to the Company."

Prior to joining AS&E in March 2004, Mr. Postle was Vice President of Sales and Marketing at SolVision Inc., a leader in automated visual inspection solutions for the microelectronics industry. Previous to SolVision, Mr. Postle was the Vice President of Sales at Sagitta, Inc., a semiconductor/telecommunications equipment manufacturer.

In the seven years prior to Sagitta, Mr. Postle held multiple senior-level positions at PRI Automation, including his most recent role as Corporate Vice President Sales, Service and International Operations. PRI Automation, acquired by Brooks Automation, Inc. in May 2002, is a global supplier of advanced factory automation systems, software and services. At PRI, Mr. Postle implemented breakthrough products and services, formed alliances leveraging the company's core businesses, and led his organization through the largest upturn in the history of the semiconductor industry, achieving record revenue and bookings.

Mr. Postle holds a bachelor's degree in business administration from the State University of New York.

About AS&E(R)

American Science and Engineering, Inc. develops and manufactures state-of-the-art X-ray inspection systems for homeland security and other critical defense applications. AS&E continues to innovate, create and develop new products by investing in new ideas through research and development, and evolving its technology to meet the needs of an ever-changing world. AS&E's patented Z(R) Backscatter technology detects plastic explosives, illegal drugs, and other contraband, even when artfully concealed in complex backgrounds by terrorists and smugglers. AS&E's Shaped Energy(TM) X-ray inspection systems combine the material discrimination features of Z(R) Backscatter imaging with the penetration capability of high-energy X-rays for dense cargoes, without the problems caused by excessive radiation. AS&E's High Energy Systems Division manufactures linear accelerators for a variety of applications including medical, scientific, security, electron beam curing and non-destructive testing. For more information on AS&E products and technologies, please visit http://www.as-e.com.

Safe Harbor Statement. The foregoing press release contains statements concerning AS&E's financial performance, markets and business operations that may be considered ``forward-looking'' under applicable securities laws. AS&E wishes to caution readers of this press release that actual results might differ materially from those projected in any forward-looking statements. Factors which might cause actual results to differ materially from those projected in the forward-looking statements contained herein include the following: significant reductions or delays in procurements of the Company's systems by the United States and other governments; disruption in the supply of any source component incorporated into AS&E's products and other factors which may cause delays in production and delivery schedules; litigation seeking to restrict the use of intellectual property used by the Company; potential product liability claims against the Company; failure of any of our products to meet performance requirements or to continue to operate reliably because of unexpected design flaws or manufacturing defects, global political trends and events which affect public perception of the threat presented by drugs, explosives and other contraband; global economic developments and the ability of governments and private organizations to fund purchases of the Company's products to address such threats; and the potential insufficiency of Company resources, including human resources, capital, plant and equipment and management systems, to accommodate any future growth, and future delays in federal funding. These and certain other factors which might cause actual results to differ materially from those projected are detailed from time to time in AS&E's periodic reports and registration statements filed with the Securities and Exchange Commission, which important factors are incorporated herein by reference. AS&E undertakes no obligation to update forward looking statements to reflect changed assumptions, the occurrence of unanticipated events, or changes in future operating results, financial condition or business over time.