Could you ask her to call me? <a href=" http://www.neighborsforpeace.org/?martin-luther-thesis#your ">paper buy</a> Matthew Greene, a popular math teacher at the school 65 miles north of Philadelphia, vanished while on a backpacking trip in California last month. Police say Greene was there to hike and climb the Eastern Sierra, a region that features extremely steep and rugged terrain, with many peaks soaring to 12,000 and 13,000 feet.