Paul Kurtz Newlin has been a lecturer in a variety of subjects at many area colleges. At Smith College, he has taught environmental history and policy, introduction to microeconomics, environmental economics, environmental science and policy capstone, and senior public policy workshop. He also lectured in microeconomics and environmental economics at Keene State University. He taught writing in economics at the University of Massachusetts Amherst. He has taught environmental policy at Amherst College, the University of Massachusetts and University of Hartford. He developed and taught a course in human ecology at Greenfield Community College. While at Mt. Wachusett Community College, he developed and taught renewable energy engineering. At Westfield State University, he taught environmental biology.

Before teaching, he served as an energy engineering consultant, conducting energy analysis at large housing projects and water treatment facilities. He also served as an IT specialist while at the National Priorities Project in Northampton, Massachusetts. Before that, he taught physics for several years at Longmeadow High School.

His academic interest continues to be focused at environmental and economic issues, especially the intersection of the two.