[1] Weiner has made contributions to several areas of plant ecology, including competition, allocation, allometry and application of ecological knowledge to agricultural production.
He served on the faculty at Swarthmore College for 18 years, where he taught courses in botany and ecology and pursued basic research on plant growth, competition, allocation and allometry.
In 2007-2008 he was a Sabbatical Fellow at the National Center for Ecological Analysis & Synthesis.
Weiner was in the first group of ISI Highly-Cited Researchers[5] and was named Distinguished Fellow of the Botanical Society of America in 2016[6] Weiner has pursued research in several areas of ecology, including (1) plant competition at the individual and population levels, (2) plant growth and resource allocation, (3) individual variation within plant populations and (4) the application of ecological and evolutionary theory to plant production systems.
He is associated with an approach to ecology that is both theoretical and empirical, analytical, mechanistic and employs simple models to generate testable hypotheses.