J. Denis Newbold, Ph.D.

624 624 Stroud Water Research Center

Research Scientist Emeritus

Ecosystem Processes Group

tel. 610-268-2153, ext. 227
970 Spencer Road, Avondale, PA 19311


  • Ph.D., Aquatic Ecology, University of California, Berkeley, California.
  • M.S., Hydrology, Cornell University, Ithaca, New York.
  • B.S., Engineering, Swarthmore College, Swarthmore, Pennsylvania.

Interests and Expertise

The flow of nutrients (primarily nitrogen, phosphorus, and carbon) to streams and rivers and how those nutrients are processed, transformed, and transported by the stream and river ecosystem.

Professional Experience

  • Research Scientist Emeritus, Stroud Water Research Center, 2011–present.
  • Research Scientist, Stroud Water Research Center, 1993–2011.
  • Assistant Curator, Stroud Water Research Center of the Academy of Natural Sciences of Philadelphia, 1985–1992.
  • Ruth Patrick Scholar, Stroud Water Research Center, Division of Environmental Research, Academy of Natural Sciences of Philadelphia. 1983–1985.
  • Research Staff Member, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1982–1983.
  • Research Associate, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1977–1982.
  • Eugene P. Wigner Postdoctoral Fellow, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1977–1979.


Effectiveness of an artificial substrate for sampling macroinvertebrates in small streams

Roby, K.B., J.D. Newbold, and D.C. Erman. 1978. Freshwater Biology 8(1):1–8.

Evaluation of streamside bufferstrips for protecting aquatic organisms

Erman, D.C., J.D. Newbold, and K.B. Roby. 1977. Contribution No. 165, September 1977. California Water Resources Center, University of California, Davis.

Biological assessment of timber management activity impacts and buffer strip effectiveness on National Forest Streams of northern California

Roby, K.B., D.C. Erman, and J.D. Newbold. 1977. Earth Resources Monograph No. 1, USDA Forest Service, California Region.

The productivity, mixing modes, and management of the world’s lakes

Horne, A.J., J.D. Newbold, and M.M. Tilzer. 1975. Limnology and Oceanography 20(4):663–666.

Oxygen depletion model for Cayuga Lake

Newbold, J.D., and J.A. Liggett. 1974. Journal of the Environmental Engineering Division 100(1):41–59.

See all publications by Stroud Center authors