The longest Marcellus Shale pipeline may be the one that extends from the heart of Texas to Western Pennsylvania.

Today, Houston-based energy law firm Sadler Law became the latest Texas firm to set up shop on the front lines of the Marcellus Shale play, opening an office in the Southpointe business park in Washington County, Pa., which is quickly becoming the hub of the natural gas industry in Pennsylvania.

Sadler Law is the third Houston firm in the past year either to open a new office or expand an existing office in Western Pennsylvania in response to the rapid growth of the oil and gas industry.