Sickels worked as research assistant to noted baseball writer Bill James from 1993 though 1996.
From 1996 to 2005, Sickels was a columnist for ESPN.com, writing regular "Down on the Farm" columns that took an in-depth look at baseball prospects.
Sickels was previously a regular contributor to the fantasy sports website RotoWire.com and can still occasionally be heard on Rotowire podcasts.
The book is wildly popular, but some sold-out versions remain available in PDF format via Sickels' website.
Sickels has also written poetry, science fiction, and has had multiple role playing books published within the Star Fleet Universe game system offshoot of Star Trek.