About RJL Systems
Pioneering Bioelectric Impedance Analysis
Rudolph J. Liedtke pioneered Bioelectric Impedance Analysis (BIA) technology for modern body composition assessment, and founded RJL Systems in 1979. Almost 35 years later, RJL Systems remains at the forefront of BIA development, engineering and customized applications. The engineering and design team at RJL continues to set the standards for the reliability and use of whole body measurements to assess total body water and body composition. Constantly conducting research and updating our BIA software and devices, RJL offers you the most advanced, safe, reliable and accurate data available. This vigilant adherence to scientific and ethical standards has paid off: RJL’s FDA-approved BIA instruments are recognized as the global standard, with more than 15,000 units in use by practitioners and researchers in outpatient, inpatient, hospital and university settings worldwide. Mr. Liedtke is widely regarded as the foremost expert in BIA system development, customization, and application.
The RJL Quantum BIA series for body composition assessment is approved by the FDA as a Class II Medical Device, and has been cited in over 1600 research studies, papers and peer reviewed articles around the globe. Publications featuring studies using RJL technologies include The American Academy of Nurse Practitioners, Journal of Applied Physiology, American Journal of Clinical Nutrition, Journal of Health Promotion, Journal of Parenteral and Enteral Nutrition, Journal of Exercise Physiology, and the Journal of Renal Nutrition.
While other companies strive to provide bioelectrical impedance assessment, RJL Systems continues to be the bioelectrical impedance assessment technology innovator. The RJL Systems engineering team – still led by Liedtke – continues to explore exciting new medical applications and research frontiers.
ENHANCING GLOBAL HEALTH & WELLNESS
Our Mission
RJL Systems will build upon our history of excellence and innovation to provide the most reliable devices of the highest quality to our customers in medicine, industry, research, and government worldwide.
Our mission is to enhance global health and wellness by delivering the most accurate, reliable, and innovative Bioelectrical Impedance Analysis (BIA) technology available. We are committed to empowering healthcare providers, researchers, and wellness professionals with tools that improve the understanding of body composition and support better health outcomes. By maintaining the highest standards of quality, precision, and customer service, we strive to lead the industry in non-invasive diagnostics and body composition analysis.
Our Vision
RJL Systems will be the most trusted and valued name in Bioelectrical Impedance Analysis(BIA) and serve as the industry standard.
CONTINUOUS IMPROVEMENT & EDUCATION
Our Commitment
RJL Systems is dedicated to continuous improvement and education in the field of BIA. The company's engineering team continues to explore exciting new medical applications and research frontiers. We offer various educational resources, including webinars and training programs, to ensure users can effectively utilize their devices. We aim to continuously innovate in response to emerging research, technological advancements, and the evolving needs of the medical and scientific communities.
Our Quality Policy
RJL Systems is committed to providing the highest quality products and services that meet or exceed customers’ expectations and requirements through the continuous improvement of our processes.
Chief Executive Officer
Meet Our CEO
Rudolph J. Liedtke began his career as an electronics technician alongside cardiovascular research pioneer Dr. Jan Nyboer at Wayne State University, where their groundbreaking work in bioelectrical impedance plethysmography became the foundation for Liedtke's lifelong mission to transform health technology. Immersing himself in scientific texts and lectures spanning medicine, technology, chemistry, physics, and electronics, Liedtke went on to direct automated machine projects and nuclear technology for the US Navy at Century Detroit, a division of Babcock & Wilcox — an engineering powerhouse rooted in Edison's legacy of innovation, originally famous for the steam boiler designs used in the first public power generator stations in the 1880s.
In 1971, Liedtke co-founded Controls Associates, Inc. with business partner Jim Slack, designing and manufacturing electronic systems for the automotive and machine tool industries. By the mid-1970s, he had also engineered the computer technology used to randomize national coupon systems to prevent fraudulent distribution.
In 1979, Liedtke launched RJL Systems, introducing his own patented formula for bioelectrical impedance analysis that set a new global standard for precision in body composition measurement. He holds patents across a range of technologies, including a Micro-Bar coliform disinfection apparatus for water retention basins, a porous, flexible, and fungus-resistant polymeric artificial nail, and a biometric health care data system network. More than four decades later, RJL's instruments are trusted by thousands of researchers and practitioners in medical, educational, and military settings worldwide, with Liedtke continuing to lead his engineering team in advancing new technological frontiers.
In his leisure time, Liedtke enjoys travel, hiking, and reading novels by Ayn Rand, Dean Koontz, and David Baldacci. He lives with his wife, Helga, in Grosse Pointe Park, Michigan.
EST. 1979
Our History
RJL Systems was founded in 1979 by Rudolph J. Liedtke, who pioneered Bioelectrical Impedance Analysis (BIA) technology. For over 40 years, RJL Systems has been the leader in providing accurate, reliable, and non-invasive body composition measurement devices and is the gold standard of BIA instruments for scientists, researchers, clinicians, physicians, and other medical professionals in various settings, including healthcare practices, educational institutions, and government agencies worldwide.
- 1979: Founded and Incorporated
- 1983: Received first ever FDA clearance of a BIA device for determining body composition.
- 1994: Participation in the NIH Technology Assessment of BIA.
- 2000: Release of the Quantum-II & Quantum-X. 6,000th unit shipped.
- 2004: Release of the Quantum Desktop. 10,000th unit shipped.
- 2006: Release of the Quantum-III.
- 2007: ISO-13485 Certification process initiated.
- 2008: ISO-9001 and ISO-13485 Certifications received.
- 2013: Release of the RJL Systems BC software iPad App.
