The teacher understands the central concepts, core information, and learning structure of the discipline he/she teaches. The teacher continually seeks out resources or avenues of inquiry to improve his/her knowledge base and increase student accessibility to insure a meaningful learning experience for students. The teacher stays abreast of new developments within the content area in order to provide students an opportunity to expand their knowledge and interest within the discipline or across disciplinary content streams.
Demonstrating this INTASC standard is important to facilitating student learning and development. A firm grasp of content allows explanation and presentation to vary according to the needs of students or classroom dynamics. A strong foundation in this standard improves the likelihood of adaptive teaching techniques and strategies.
I demonstrate this standard by my test scores on the Praxis 1 and 2 exams, as well as the VCLA and RVE exams. These exams cover a robust rigorous, and comprehensive evaluation of content mastery and pedagogical methodology.
A second way I demonstrate this standard is by my performance in my coursework in pursuing my M.A.T at Hollins. The study of pedagogy, its methods, and how learners access information will be of great value in reflective teaching practices.
A third way I demonstrate the standard is by my instructional delivery and design. A sound basis in content knowledge allows a teacher to make real world connections to student learning. This provides students with a meaningful learning experience based in understanding rather than memorization. 
For more information see the link to my paper on Professional Knowledge.