AtoZ-CRO provides Clinical Research, Monitoring, Pharmacovigilance, Biometry and Regulatory Solutions to the global life science industry


AtoZ-CRO GmbH is a German full-service clinical research organization. We provide comprehensive outsourcing solutions to the global life science industry. The company has more than 35 years expertise in Clinical Studies, Monitoring, Regulatory, Pharmacovigilance and Biometry on a national and international level. AtoZ-CRO GmbH has significant presence in Western- and Eastern-Europe, here offering a state-of-the-art Early Phase Unit as well as fast and consistent patient recruitment. The company serves clinical trials for pharmaceuticals and radiopharmaceuticals (Phase I – IV), medical devices, nutritionals and cosmetics. Our highly flexible, qualified and motivated staff advances all customer projects with high quality, short communication ways and a quick decision making.

AtoZ in numbers:

Years of Experience


Projects Completed


Countries Included

> 40


> 200


> 60


  • 1984Establishment

    In 1984 Dr. med. Ernst Günther Lenhard founded "DR MED LENHARD & PARTNER GmbH" as a clinical research institute
  • 1986Services

    From the early years, studies off all clinical phases were conducted (phase I - IV)
  • 2007Change

    In 2007 Dr. med. Karl-Peter Klein took over as the new Managing Director
  • 2009Renaming

    In 2009 the company was renamed as AtoZ-CRO GmbH
  • 2010Expansion

    Dr. Karl-Peter Klein has continued the success of AtoZ-CRO GmbH by adding new focal points (e.g. USA and Asia)
  • 2014Anniversary

    AtoZ-CRO GmbH celebrates its 30th anniversary and is proud of its long tradition
  • 2017Updates

    AtoZ-CRO is now offering worldwide services