Some regions prefer one page resumes while others prefer two page resumes.
Here in Washington, the Greater Seattle area, many employers prefer a one page resume. However, a woman who conducts job search workshops in New York for hundreds of job seekers each week, told me that it is standard that almost everyone there use a two page resume. She said that only the most inexperienced people can get away with a one page resume. So take in your region's preferences when deciding upon a one page or a two page resume. Also, job seekers with extensive technical skills, education, presentations, publications or association affiliations often need a two page resume.