There is a lack of literature linking end-user behavior to the availability of open-source intelligence (OSINT). Most OSINT literature has been focused on the use and assessment of open-source intelligence, not the proliferation of personally or organizationally identifiable information (PII/OII). Additionally, information security studies have shown that just the accidental release of information to the public was the second highest cause of all data breaches and resulted in an average loss of $194 per capita. This study illustrates the notion that information security awareness can play a significant role as the first step in reducing this loss, as well as, the availability of organizationally-identifiable information. Extant literature reviewed within this study also posits that the end-user is often the point of security failure, and computer or information security awareness, which is considered one of the simpler methods for defending an organization's attack landscape, is often forgotten. It stands to reason that with the end-user still being a primary concern for the ingress of malicious mobile devices, email, and other malicious code into the organizations, that an investigation into the relationship between security behavior and open-source intelligence awareness be explored. This exploration was performed through quantitative research using the SANS Institute's Security Awareness Survey. The results of the survey found a significant relationship between an IT knowledge worker's years of experience and their security behavior, as well as, their security behavior and their awareness of open-source intelligence concepts which was the main focus of this study. There are several recommendations for organizational leadership, specifically, the development of more robust security education, training, and awareness programs which focus on open-source intelligence as an element of operational security. Recommendations for future research include additional survey modification, improving generalizability, and identifying motivational themes for non-compliance with model security behavior through a qualitative analysis of IT knowledge worker perceptions. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]