The NKJV reads "captain of their salvation." The KJV reads "author of their salvation," and He was made "perfect through sufferings." The word "author" or "captain" is translated from the Greek term archegos. It is a word capable of many translations. In secular Greek, in their pantheon of gods, Zeus was called "archegos" of the gods, meaning he was the head or the chief of all the gods. Incidentally, "head" or "chief" is archegos' simplest literal meaning.