Neal Frey reads textbooks for a living, a job he finds singularly fulfilling. For more than two decades, he had labored on behalf of Educational Research Analysts, a conservative Christian textbook-reviewing organization in Longview, Texas, founded by the famously outspoken husband-and-wife team of Mel Gabler and Norma Gabler. Since the early 1960s, the organization has sought to rid textbooks of factual errors, perceived liberal bias, and what its reviewers otherwise deem inappropriate content, mostly by exhorting publishers and state officials to make the changes they want. When Mr. Gabler died in 2004 at age 89, and Mrs. Gabler grew ill, it fell to their friend and protege, the 61-year-old Frey, to keep the reviews coming. Under Frey's direction, assisted by his wife, Judy, the textbook shop has steadily evolved from the Gabler's era. A former college professor, he works in near-anonymity, making his points through the faxes and newsletters he sends to subscribers and textbook decisionmakers. What remains unchanged, however, is the organization's commitment to conservatism and the discipline of textbook review. These are not abstract convictions. He understands the forces that guide the multibillion-dollar textbook industry and dictate which printed materials end up in classrooms, and he believes the meticulous, often tedious process he follows allows him to bend that process to his liking.