Apparently, Marta Keen's publisher is Lorenz. Here's the Marta Keen biography from the Lorenz Website:

Marta Keen has written and published children's songs and choral works since 1982. She completed a B.A. in English and Music at Texas Christian University in 1975, then performed full-time for four years with her own show band touring eight states and British Columbia. She then completed music certification at Portland State University in Portland, Oregon in 1979.

During her 16 years as a music educator for grades K-12, she completed a master's degree in Library Science, wrote and directed children's musicals and performed as a pianist and singer throughout the Seattle, WA and Portland, OR areas. She received a graduate assistantship to Pacific Lutheran University, where she sang with the Choir of the West and studied choral composition. In 1996, Marta relocated to Las Vegas to become an elementary school librarian and accompanist for the school's honor choir. Composition has taken a back seat to motherhood; her son Eli, now 5, has a passion for blues guitar and a knack for parody lyrics. Marta continues to arrange for and accompany church and community choral groups in the Las Vegas area.