The jury as critic: An empirical look at how capital juries perceive expert and lay testimony.

Sundby, S. E. (1997). The jury as critic: An empirical look at how capital juries perceive expert and lay testimony. Virginia Law Review, 83, 1109-1188.

Presented interview data on witness impact (including expert). Professional experts called in most cases. Jurors generally reported lay expert testimony to be most influential; skeptical of professional experts, family members, and friends. Professional experts often viewed as hired guns; those who applied principles to case in concrete fashion viewed as most helpful to their side’s case.

http://www.albany.edu/scj/documents/Sundby_1997_VirginiaLR.pdf