In lieu of a wedding announcement, the billionaire philanthropist MacKenzie Scott’s second husband, Dan Jewett, a science teacher, proclaimed their marriage last year by publicly promising to join her in donating their enormous fortune to good causes.A year and a half later, his name has quietly vanished from her philanthropic endeavors. On the site for the Giving Pledge, where billionaires promise to give away half of their wealth before they die, his letter no longer appears with hers. Without fanfare, his name was recently edited out of a Medium post Ms. Scott had written last year about their gifts. Previously, grateful nonprofits that had received grants from Ms. Scott and Mr. Jewett thanked them both, but recent recipie …
