Bellevue-based DreamBox Learning, the developer of K-3 math education software, said this morning that it has hired on two new executives to bolster its executive ranks. The firm said it has named Greg Long as Senior Vice President of Product Development, and Patti Smith as Vice President of Marketing and Product Management. Long was previously Chief Product Officer at Rosetta Stone, and also has served at LeapFrog Schoolhouse and The Learning Company. Smith was most recently Vice President of Portfolio Management, K-12 Mathematics at Houghton Mifflin Harcourt. She also has been at Thinkwell Corporation and Kaplan Educational Centers.