DoorDash adds former Amazon and Apple executive Diego Piacentini to its board ... Cadence, electronic systems design company, promotes board member Mary Louise Krakauer, former Dell chief information officer, to chair, succeeding Walden International Chairman Lip-Bu Tan ... Kajeet, IoT solutions company, names Kore’s Esteban Ibarra vice president-channel sales ... Marketing agency Gradient Experiential adds Wei Wu, who previously taught 3D scanning and digital fabrication at Harvard University, as creative technologist.