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Sonnax and Rostra Powertrain Controls Join Workforces

Sonnax Transmission Company announced a recent reorganization that will integrate Rostra Powertrain Controls into its Vermont- and North Carolina-based operations. This concludes several years of internal moves aligning teams and resources to better serve the transmission aftermarket. Both the Sonnax and Rostra brands have been part of Marmon Holdings, Inc. since 2018, with Steve Boyer leading both teams as president since 2020.

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“Through this integration, Rostra and Sonnax will become a single, transmission-focused organization,” said Boyer. “This new structure will synchronize our product development efforts, reduce time to market of new products and allow us to make improvements in quality and delivery to our shared customers.” 

Boyer said several internal promotions were made to support the alignment of both brands under the Sonnax banner: 

Maura Stafford is appointed company Vice President of Transmission Products. Stafford and her team manage product groups focused on hydraulic and electronic transmission components, solenoids and remanufactured valve bodies. 


Steve Jaussaud continues as company Vice President of Product Line Management, guiding the development of torque converter, high-performance, driveline and mechanical transmission components. Jaussaud also manages the torque converter product line, a responsibility he assumed in late 2020. 

Beth Houder is appointed company Vice President of Marketing & Communications, leading marketing efforts and the continued development of both brands in the aftermarket industry. 

And Mark Kaplan will serve as company Vice President of Sales, assuming sales management for Sonnax and Rostra. He is joined by Seth Baldasaro, Director of Strategic Accounts, and Tony Diorio, National Accounts Manager. 



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