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Halvor Niels Christensen was a professor and researcher in the field of biochemistry, specializing in amino acid transports. The majority of his academic career was spent at the University of Michigan where he was a professor (1955-1986) and chair (1955-1970) of the Biochemistry department. The bulk of this collection is correspondence covering 1968-1997. Also biographical material, selected articles (reprints) authored by Christensen, and photographs of Christensen and colleagues including Albert Baird Hastings and Olliver Lowry.

The bulk of the Halvor N. Christensen collection consists of correspondence covering the years 1968-1997. The papers also include biographical material, selected articles (reprints) authored by Christensen, and photographs of Christensen and colleagues including Albert Baird Hastings and Olliver Lowry. The collection has been divided into four series: Biographical Information, Correspondence, Articles and Reprints, and Photographs.

The University of Michigan News and Information Services functions as the university's media relations office. It disseminates information and images about university programs, research, events, and faculty and staff activities. This series of News and Information Services photographs is comprised of portraits of more than ca. 7,000 individual faculty and staff members spanning the years 1946-2006 (bulk 1950-1990).

This series of faculty and staff portraits, commonly known as "Series D", is part of the News and Information Services photographs collection, which consists of several other series often based on format such as the size of the negatives (4x5 or 35mm) or content (general campus photography or aerial photographs). Series D consists of black and white 4x5 inch negatives and 1-1/4 x 2-1/4 inch prints and negatives of faculty and staff (and some student) portraits alphabetically arranged.

The negatives were received in several accessions prior to 2007 totaling 7.5.f linear feet (15 boxes). These accessions were physically interfiled into a single alphabetic run. In 2016 a final accession 5.5 linear feet (15 boxes) of analog negatives were received. These have not been physically interfiled so the collection now consists of two alphabetic runs. However, in the container listing of this finding aid the files are presented in a single alphabet. Based on information supplied on the original negative envelopes, the listing includes faculty/staff name, department or unit (when provided) and date(s) of the portrait. Bentley Library negative numbers are included (if applicable)

The latest accession marks the end of the News and Information Services analog photography. The faculty and staff portrait series is continued in the Bentley Library's Michigan Photography digital photo collection.