Proof-ACS

Who we are

PROOF-ACS GmbH is an independent company, solely financed by organisation of competence schemes and the distribution of reference materials. Four shareholders only allow flat hierarchies and a fast decision-making process.

Therefore, PROOF is able to assess analytical results in an independent way – detached from any external parties.

Shareholders are:

  • Dr. Silke Bruns
  • Dr. Günter Lach
  • Dr. Birgit Schindler
  • Dr. Ralph-Matthias Schoth

Dr. Silke Bruns, Dr. Günter Lach and Dr. Ralph-Matthias Schoth are acting as consultants and support the business development of PROOF-ACS.

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Dr. Birgit Schindler

Operates and generally manages the business of PROOF-ACS GmbH from the very beginning in 2013 until today.

Dr. Birgit Schindler has in-depth, hands-on experience in analytical method development in complex matrixes and in method validation. As a research scientist she published several articles in high-ranking international journals and presented her work in national and international conferences. She has multi-annual experiences with External Quality Assessment Schemes from both perspectives: of the participant as well as of the organiser.

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Dr. Rieke Himstedt-Klüver

Manages environmental and special projects for PROOF-ACS GmbH since June 2024. 

Dr. Rieke Himstedt-Klüver is experienced in analytical method development and method validation as well as in quality management of accredited analytical laboratories. She has multiannual working experience in an ISO/IEC 17025 accredited laboratory for environmental analysis with a broad scope of methods. During her time at the laboratory, she gained experience with internal and external Quality Assessment Schemes as deputy quality manager and later as quality and laboratory manager. 

2015
Degree as European Registered Toxicologist / Fachtoxikologin DGPT after successfully participation in multi-annual training courses of the German Society for Experimental and Clinical Pharmacology and Toxicology (DGPT).
2009 to 2012
Deputy head of the laboratory Human Biomonitoring (Department Toxicology) at the Institute for Prevention and Occupational Medicine of the German Social Accident Insurance. The working team of Dr. Birgit Schindler was responsible for the Quality Assurance and the organisation and realisation of the External Quality Assessment Schemes in the pan-European COPHES project.
2009
Doctoral degree (Dr. rer. nat/PhD) in Occupational Toxicology and Analytical Chemistry at the Institute of Occupational, Social and Environmental Medicine of the Friedrich-Alexander University Erlangen, Germany. PhD thesis: "Development and Application of Analytical Methods to Quantify Metabolites of Organophosphorus Flame Retardants in Human Body Fluids".
2005 to 2009
Along with the PhD studies - scientific secretary of the working group "Analytical Chemistry, Analyses in Biological Material" of the "Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area" of the German Research Foundation (DFG).
2005
University diploma in Chemistry with focus on Analytical Chemistry and Toxicology (Friedrich-Alexander-University of Erlangen, Germany).
2020 to 2024
Chemisch-Technisches Laboratorium Luers GmbH & Co. KG From employee to deputy quality manager in 2021, to quality and laboratory manager in 2023.
2020
Doctoral degree (Dr. rer. nat./PhD) in Analytical Chemistry with focus on structure elucidation at the University of Bremen, Faculty 2 Biology/Chemistry, Germany. PhD thesis: “Isolation, Structure Elucidation and Investigation of the Chemical Ecology of Secondary Metabolites from Fungi of the Genera Mycena, Spinellus and Trichoderma”.
2015 to 2020
Along with the PhD studies – scientific assistant of the working group “Instrumental Analytics” (University of Bremen, Germany).
2015
Master’s degree in Chemistry with focus on Analytical Chemistry and structure elucidation (University of Bremen, Germany).
2013
Bachelor’s degree in Chemistry with focus on Analytical Chemistry and structure elucidation (University of Bremen, Germany).