Leading with expertise and commitment
Our executive leadership team leverages extensive experience in life sciences and diagnostics to deliver cutting-edge solutions, foster collaborative partnerships, and consistently meet the evolving needs of customers and suppliers worldwide.
Siddhartha Kadia, PhD
Chief Executive Officer
Dr. Siddhartha Kadia brings over two decades of leadership experience in the life sciences and diagnostics industries, with a proven track record of driving growth, innovation, and strategic transformation across global organizations. Before joining Calibre Scientific, Dr. Kadia served as president and CEO of PhenomeX, a publicly traded biotechnology tools company, guiding it through to its acquisition by Bruker in 2023. Prior to this, he held the role of president and CEO at EAG Laboratories, a private company delivering scientific solutions across diverse industries. Earlier in his career, Dr. Kadia spent nearly nine years with Invitrogen/Life Technologies, where he held multiple leadership roles across the US, Japan, and China, ultimately leading all reagents and bioprocess brands as president of the Life Sciences Division before the company's acquisition by Thermo Fisher Scientific in 2014. Dr. Kadia holds a PhD in biomedical engineering from Johns Hopkins University School of Medicine, where he was honored with the David Israel Macht Award for Excellence in Research, and a Master of Science in biomedical engineering from Rutgers University.
Bill Kullback
Chief Financial Officer
Bill Kullback joined Calibre Scientific in June 2025. As CFO, Kullback oversees the company's global finance organization, including financial planning and analysis, accounting, investor relations, treasury, tax, IT, and procurement. Having held CFO positions at multiple public companies, Kullback brings more than thirty years of progressive finance and executive leadership experience spanning midsized to large manufacturing corporations in the medical device and life sciences sectors. Kullback previously held notable CFO roles at Lombard Medical and a variety of other companies where he managed significant finance undertakings, including venture financing, acquisitions, IPO preparations, and compliance with regulatory standards. Kullback received his MBA and BA from State University of New York at Buffalo.
Amanda Halford
President,
Distribution & Service Businesses
Amanda Halford accepted the position of president of Calibre Scientific's global Distribution & Services division in September 2025. She's responsible for driving strategy, execution, and governance to expand reach, elevate customer experiences, and ensure operational excellence. Halford brings more than thirty years of leadership experience in the life sciences sector, with a strong track record for scaling global scientific businesses through commercial and innovation leadership. Most recently, she served as president of Cytiva Bioprocess, where she oversaw the integration of Cytiva and PALL Life Sciences to create the global leader in products and services for biomanufacturing and development. Previously, Halford served as vice president of Sales, Service, and Commercial Operations at Cytiva and executive vice president of Life Sciences at EAG, Inc., and she held senior leadership positions at Sigma-Aldrich, including vice president of Academic Research Business, vice president of Chemistry and Materials Science Business Units, and vice president of eBusiness. Halford holds a BSc Honours in chemistry from Imperial College London, an executive MBA from EM Lyon, France, and has completed executive programs at INSEAD and Washington University in St. Louis, MO. She brings a truly global perspective to the Calibre Scientific business, having lived across Europe and the US and worked with customers in over forty countries.
Evangeline Gonzalez
President,
Proprietary Products Business
Vangie Gonzalez joined the company in July 2025 to lead the global portfolio of Calibre Scientific's Proprietary Products Businesses. Gonzalez brings over twenty-five years of global executive experience across the life sciences industry, with a strong track record in P&L leadership, innovation, product development, manufacturing, marketing, and commercial strategy. Most recently, she served as president of the Diagnostics Division at Antylia Scientific (acquired by Brookfield for $1.34B), where she led five acquired companies, oversaw approximately $100M in revenue, and managed a team of over 350 people across the US and EU, serving more than ten end markets. Prior to her role at Antylia, Gonzalez held senior leadership roles including SVP of Life Sciences Strategic Marketing at Becton Dickinson, SVP of Global Marketing at Danaher's Beckman Coulter Diagnostics, and chief marketing officer for the Life Sciences Division at Life Technologies (now part of Thermo Fisher Scientific). Gonzalez holds a Bachelor of Arts in Chemistry, a Bachelor of Science in Biochemistry, and an MBA in Entrepreneurship from San Francisco State University. She is known for her creative leadership, commercial focus, and executional excellence.
Joseph Lee
Chief Digital Officer
Joseph Lee joined the company in November 2025 and oversees its global initiatives in brand development and e-commerce strategy. He also leads global IT, including infrastructure, cybersecurity, enterprise applications, as well as company-wide commercial integration and the digital transformation strategy. With over 20 years of leadership experience in the life sciences and TIC (testing, inspection, and certification) industries, Lee brings deep expertise across brand strategy, marketing, product design, e-commerce, emerging technologies, and digital technologies to the role of chief digital officer. Prior to joining Calibre Scientific, Lee served as EVP of digital strategy & customer experience at ALS Ltd., where he led a brand refresh and digital initiatives that significantly enhanced customer engagement. Lee also held senior leadership roles at Thermo Fisher Scientific and Life Technologies, where he drove strategic programs in brand strategy, product design innovation, and emerging technologies—transforming how customers interact with cloud-based instruments and lab tools. Lee holds a Bachelor of Arts in communication design from the University of Illinois Chicago and completed the Business Marketing Strategy Executive Program at Northwestern’s Kellogg School of Management. His work has earned Red Dot and IDSA awards for industrial product design excellence.
Kristin Orlowski
Senior Vice President,
People & Culture
Since joining Calibre Scientific in 2021, Kristin Orlowski has shaped the company's global people strategy, driving talent acquisition, leadership development, and employee engagement across more than 1,000 employees in twelve countries. Her vision for a high-performing, inclusive culture ensures that organizational growth and business objectives are fully aligned with the development of its people. Orlowski brings more than twenty years of experience transforming people and culture systems for high-growth, complex organizations. She has held senior leadership roles at University of Michigan Athletics, Toys "R" Us Global Headquarters, and MASCO Cabinetry, where she designed and implemented talent strategies that strengthened culture, advanced leadership capability, and created measurable business impact. At Calibre Scientific, she has scaled the workforce fivefold, guided People operations through fifty-eight acquisitions, and led the first global Culture and Engagement survey—demonstrating her ability to align vision, strategy, and execution at scale. Orlowski holds a Master of Science in public administration with a focus in human resources from the University of Michigan, is HRCI-certified (SPHR), and is an active member of SHRM.