Private equity firm Main Post Partners invested in The Happy Planner, a fast-growing, creative lifestyle brand. Financial terms were not disclosed. "We are excited to partner with Main Post, who understand and support the brand's core mission of empowering people everywhere to embrace the positive and change lives," said Stephanie Fleming, co-founder of The Happy Planner. "This investment provides us with additional resources to continue to build our team and expand the ways the brand has to positively impact our growing community of Happy Planners."