Bachelor of Science in Mathematics, Iowa State University, 1965. Master of Science in Mathematics, Trinity College, 1970. Master of Business Administration, University Rhode Island, 1982.
Mathematics teacher Public High Schools, Avon, Farmington, Bloomfield, Connecticut, 1966-1968, Ulster Academy, Kingston, New York, 1971-1973. Mathematics instructor Ulster County Community College, 1973. Mathematics editor Houghton Mifflin Company, Boston, 1974-1977.
Mathematics instructor Bristol County Community College, Fall River, 1977-1978. Assistant director editorial American Mathematics Society, Providence, 1978-1981, director of publication, 1982-1985. Founder, president Janson Publications, Inc.
(purchased by Tribune Education Group), Providence and Dedham, Massachusetts, 1985-1996. President Janson Publications, Inc., Dedham, 1996-1998. Public consultant Everyday Learning/Tribune Education Group, 1996-1998.
President Janson Associates, Dedham, since 1996. Overseer Boston Ballet, since 2003. Member expert panel materials development reformed National Science Foundation, 1996-1999.
Representative science publication committee American Heart Association, 1986-1990. Member Rhode Island State Advisory Commission on Libraries. Member Rhode Island Legislation Commission for Mathematics and Science Education, 1991.
Member advisory committee Rhode Island State Systemic Initiative in Mathematics and Science, 1993-1994. Massachusetts state advisory board Mathematics & Science Education, since 2000.
Board directors Planned Parenthood of Rhode Island, Providence, 1986-1987, First Parish Unitarian Church, Beverly, Massachusetts, 1975-1976. Member steering committee American Mathematics Project, Berkeley, California, 1986-1992. Member oversight committee Resources Mathematics Reform Educational Development Center, Newton, Massachusetts.
Advisory member Rhode Island State Council on Libraries. Overseer Boston (Massachusetts) Ballet, since 2003. Member American Association for the Advancement of Science, League of Women Voters, Society for Scholarly Publishing (board directors 1986-1990, chair annual meeting 1985), New York Academy of Sciences, American Mathematics Society, Mathematics Association American, National Council Teachers of Mathematics, Association American Publishers (journals. committee 1982-1985), National Association Women Business Owners.
Married W. John Shallenberger, February 24, 1963 (divorced September 1980). Children: Mona, Ann; married John Batty Henderson, September 8, 1984 (divorced 1990). Married Arthur R. Hilsinger, August 31, 1997.