Leadership

Mary Haas

General Manager

Dr. Haas has global responsibility for Rotoflow machinery and aftermarket services. Her scope includes commercial activities, engineering, technology, and manufacturing. She joined Air Products in 2003 as R&D technology manager for Electronic Materials, developing commercially proven products spanning microelectronics and solar technologies. Following this, her roles included business manager for liquid and bulk hydrogen, carbon dioxide, and oil field services in the Houston regional business office, and director of transformation, quality, and continuous improvement for engineering, manufacturing, technology, and equipment, where she was responsible for organizational transformation and change management, as well as ongoing competitiveness and growth initiatives across all product lines and processes. Dr. Haas received a B.A. degree in chemistry from Drew University and a PhD in chemistry and materials science from Princeton University.

Darren Prosser

Global Business Manager, Turbomachinery Aftermarket Services

Mr. Prosser is responsible for managing our global aftermarket team focused on providing outstanding customer service and offerings relating to turbomachinery. He has over two decades of turbomachinery expertise, including his most prior role as director of engineering and technology for Air Products CryoMachinery Business. In this position, Mr. Prosser was responsible for the development, design, supply, and support of centrifugal and reciprocating machinery systems, guiding new product and technology development, directing Air Products’ entry into the direct expander sale of equipment market with the Rotoflow acquisition. Mr. Prosser holds a B.S. in mechanical engineering from Purdue University and served as a Combat Engineer in the U.S. Army on active duty and in-reserve for eight years.

Ethan Eiswerth

Product Development Manager

Mr. Eiswerth is responsible for research and development of new technology and process improvements as well as managing proposal development and new product development teams. He has 17 years of turbomachinery engineering experience after having held numerous engineering roles within the Air Products CryoMachinery Department. As a product development engineer, Mr. Eiswerth led the development of a new, high-speed, permanent magnet generator-loaded, gas-bearing expander, with power recovery, and developed concepts for an in-line expander for LNG applications. Prior to this, as a machinery design engineer, he performed commissioning and startup of Air Products equipment on the world’s first operating floating LNG production plant. Mr. Eiswerth holds a B.S. in mechanical engineering from Bucknell University and has extensive experience with API-617, API-614, API-670, ASME B31.3, and ASME BPVC Sections II, VIII, and IX.

Matt Johnston

Design Engineering Manager

Mr. Johnston is responsible for the engineering and design of Rotoflow equipment. In this role, he leads engineering, design, and project management teams and is responsible for ensuring operability, reliability, and functional excellence for Rotoflow products. Having been with Air Products for almost 30 years, Mr. Johnston has extensive experience with cryogenic turbomachinery. Prior to his current position, he was a mechanical design engineer, responsible for the concept, layout, performance, reliability, installation, commissioning, start-up, and troubleshooting of turbomachinery. Mr. Johnston holds a B.S. in mechanical engineering from Purdue University.

Ellen Walter

Marketing Manager

Ms. Walter is responsible for growing the business through strategic marketing planning and implementation with a focus on the existing base of business, new product development, and new opportunities. She is also responsible for overseeing all brand development and management for the new branding of Rotoflow. Prior to joining Rotoflow, she spent ten years at Synergis Technologies, where she introduced and grew digital marketing efforts, helped build the marketing stack necessary for ongoing lead generation, and rebranded the organization. Additionally, she is an adjunct faculty member at DeSales University, teaching marketing strategy. Ms. Walter holds a B.S. from Ursinus College and an MBA with a concentration in marketing from Saint Joseph’s University.