Do an author's credentials automatically mean he or she is a trustworthy and believable expert?

Answer: tokugawa ieyasu (徳川家康, january 31, 1543 – june 1, 1616) was the founder and first shōgun of the tokugawa shogunate of japan, which effectively ruled japan from the battle of sekigahara in 1600 until the meiji restoration in 1868.