Even with the best technology in the world, there is one key element that determines student success: a high-quality, highly-effective teacher.

In fact, some research estimates that teachers can impact students' lifetime earnings by 10 to 20 percent, which can increase the U.S. gross domestic product by tens of trillions of dollars.

And professional development (PD) is critical in helping teachers as they continue to hone their skills and evolve as educators. But what kind of PD is most effective, and does the kind of PD that helps teachers best change as teachers become more experienced?

A new study series tackles those very...

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About the Author:

Laura Ascione

Laura Ascione is the Managing Editor, Content Services at eSchool Media. She is a graduate of the University of Maryland's prestigious Philip Merrill College of Journalism. When she isn't wrangling her two children, Laura enjoys running, photography, home improvement, and rooting for the Terps. Find Laura on Twitter: @eSN_Laura http://twitter.com/eSN_Laura