Rentschler Appoints Mark Caswell as Vice President, US Facility Site Head

Rentschler Biopharma has appointed Mark Caswell as Vice President and Site Head. He joined Rentschler in July 2022 and is managing all operations at the company’s US facilities in Milford, MA.

Caswell has more than 25 years of experience in the biopharmaceutical industry. Prior to joining Rentschler, he worked for over six years at Lonza Biologicals, most recently as Head of Operations at the Portsmouth, NH site. Before that, he worked for many years at Sanofi Genzyme (previously Genzyme) in positions of increasing responsibility.

“I am excited to welcome Mark Caswell to the Rentschler team. His many years of experience in the biopharma and CDMO space and diverse background in various areas of operations make him the perfect leader to run our US operations,” said Frank Mathias, CEO of Rentschler. “An important part of his responsibilities will be overseeing the completion of our state-of-the-art RBMC facility, the largest expansion in Rentschler Biopharma’s 150-year history.”

The responsibilities of Martin Kessler in his role as CEO of Rentschler Biopharma Inc. have been transferred to Caswell.

Special Issue

Circular Plastics Economy
Explore the Future of Plastics

Circular Plastics Economy

This special CHEManager issue explores the industry’s pivotal shift towards a more sustainable, circular plastics value chain. Readers will find expert analysis and real-world solutions for today’s most pressing recycling and regulatory challenges.

Virtual Event

Downstream Purification
Bioprocess Forum

Downstream Purification

Save the Date: November 21+25, 2025
Join leading scientists, process engineers, and biomanufacturing innovators for a two-day virtual event exploring the latest breakthroughs in downstream purification.

most read

Photo
28.07.2025 • NewsChemistry

VCI Welcomes US-EU Customs Deal

The German Chemical Industry Association (VCI) welcomes the fact that Ursula von der Leyen, President of the European Commission, and US President Donald Trump have averted the danger of a trade war for the time being.