ATMI Reorganizes Materials Division; Appoints New Vice-President, Sales; Daniel Marks Joins ATMI's Materials Group From Applied Materials.

Business & Technology Editors

DANBURY, CT--(BUSINESS WIRE)--January 6, 2000

ATMI, Inc. (Nasdaq: ATMI), today announced the reorganization of its Materials Division. Over the last three years ATMI has acquired several companies, including ADCS, ACSI, NOW Technologies, and Newform. To gain the operational advantages of the critical mass ATMI has built in the semiconductor market, and to continue building the ATMI brand, the Materials Group has been reorganized with a Global Product Line focus. ATMI Materials, which supplies specialty materials and delivery systems to the worldwide semiconductor industry, represents about half of ATMI's overall revenues.

Dan Marks has been appointed Vice-President, Sales for ATMI Materials. Mr. Marks was most recently Applied Materials', Senior Director, Marketing and Business Development, Thermal Products. Robert Welch was promoted to Vice-President, Marketing; Dennis Brestovansky to Vice-President, Gas Operations; and Steve Hatch to Vice-President, Liquid Operations. The recently acquired Newform packaging business will be integrated with the NOW operations, under the leadership of NOW President Terry Nagel.

Doug Neugold, Executive Vice-President of ATMI Materials, said, "Our Materials business is organizing to achieve several goals. As the market consolidates, we need to realign our product offerings, while more clearly articulating the value our bundled product and service solutions can bring to customers. We are organizing to deliver a stronger customer and technical focus, to serve our key customers better, and to get our innovative products to customers more quickly. We are also aligning our resources to increase attention on the resurgent Asian markets. To help drive these changes and achieve our goals, we selected Dan to fill this critical position in our new ATMI Materials organization. His excellent industry experience and great track record will help catalyze our efforts throughout the global semiconductor industry."

Dan Marks, ATMI Materials Vice-President, Sales, said, "I am attracted to ATMI by their strategic focus, their outstanding specialty materials reputation and intellectual property, and their innovative production-proven processes. They are clearly on the path to help redefine the complex relationships between end-users, original equipment manufacturers, and material innovators. I see ATMI's complete package of products and services helping customers get to market faster during these times of rapid materials change. It's a great time to be working with customers to devise new solutions. I look forward to this, as a key member of the innovative, high growth ATMI organization."

About Dan Marks

Before joining ATMI, Dan worked for Applied Materials as Senior Director, Marketing and Business Development, Thermal Products (LPCVD, Oxidation, Diffusion, RTP). He was directly responsible for developing and executing marketing and selling strategies. Dan also directed strategy for the group's 300mm wafer program, and supervised various performance programs for the Field Operations groups.

Prior to joining Applied Materials, Dan worked for Tokyo Electron Ltd. (TEL) America as Diffusion/LPCVD Business Unit Manager, Sales and Marketing Manager, and Product Manager. He also gained experience with Zygo, Tencor, and Watkins-Johnson in various sales and support positions. He received his B.Sc. from Berkeley. Dan will be based at ATMI's West Coast headquarters in San Jose.

ATMI provides products and services for semiconductor device manufacture through its Materials and Technologies units. ATMI Materials includes thin film materials and delivery systems, sub-atmospheric gas delivery systems, high-purity materials packaging systems, and photolithography and chemical-mechanical polishing materials. ATMI Technologies includes process and environmental solutions, thin film deposition services, smart card solutions, and other ATMI ventures.

Statements which are not historical information are forward looking, and involve risks and uncertainties, including, but not limited to: changes in semiconductor industry growth or A T M I's markets; competition, problems, or delays developing and commercializing new products; problems or delays in integrating acquired operations and businesses into A T M I; and other factors discussed in A T M I's filings with the Securities and Exchange Commission. Such risks and uncertainties could cause actual results to differ from those projected.

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