As the current chairman and former CEO of Martin Marietta Materials, Stephen Zelnak Jr. has spent plenty of time in both corporate boardrooms and in the halls of government.

Zelnak ran Raleigh-based Martin Marietta for more than a quarter-century before stepping down as CEO at the end of 2009. During that period he worked with Republicans and Democrats, as the health of Martin Marietta, which provides the crushed stone, sand and gravel used to build roads, subdivisions and commercial buildings, is closely tied to state and federal infrastructure spending.

Now Zelnak, 67, is back in the public eye as a member of the American Institute for Growth, a Dallas-based advocacy group that has the stated mission "to educate Americans on what business needs to restore dynamic job growth."

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