Editor's Message Thoughts on the evolution of hydrogeologic practice in the USA during the last 40 years

The intent of this Editor’s Message is to (1) review changes that have occurred in the practice of hydrogeology in the USA during the last 40 years, the span of my career in the US Geological Survey (USGS), and (2) appraise how these changes are likely to impact the career of hydrogeologists now entering the field. The review reflects a perspective influenced by the author’s personal biases, but the discussion of the hydrogeologic practices of 40 years ago should reasonably represent the then prevailing state of the art. Also, although the many changes that have occurred in hydrogeologic science impact the careers both of the practitioner and of the researcher, the appraisal is limited to a discussion of the effects of change on hydrogeologic practice. Both the review and the appraisal are deficient in their discussion of international developments and conditions in hydrogeology, and may be considered parochial, particularly in a journal that prides itself on its international outreach. Perhaps this Message will inspire those with a broader international perspective to write of their impressions on the evolution of hydrogeologic practice on an international scale.