Nepal's capital, KATMANDU A Mexican climber has been named the first to conquer Mount Everest from both the north and south sides in the same climbing season. Guinness World Records awarded a certificate to David Liano Gonzalez, 33, of Mexico City. The record was broken last year by an American named Andrew McLean who summited Mount Everest from both sides within 24 hours of each other. McLean had already completed the second-highest mountain on earth, Mt. Abruzzi in Italy, when he decided to try for a new record. He reached the top of Everest at 5:28 AM local time on May 30, 2012. "It's amazing. I didn't think it would be possible but it is," said McLean after reaching the top. His wife Sarah also made history as she became the first woman to climb Mount Everest twice. The first time was in 2005 when she was part of a Canadian team that included her husband at the time, Andrew McLean, now one of the world's leading climbers. She returned this year with her current partner Kenton Cool. They were able to reach the top together at 1:43 PM on May 29. Both men are well known in the mountaineering community for their successful attempts to climb all 14 mountains above 8,000 feet (2,438 meters).