1996 – Present Project Director, Tropic Ventures Rainforest Enrichment Project at Las Casas de la Selva, Puerto Rico.
1994 – 2006 – VP, Director of Agricultural and Horticultural Systems, Global Ecotechnics Corporation.
1995 – Present CFO, Planetary Coral Reef Foundation.
1993-1994 Director of Agriculture and Food Systems, Space Biospheres Ventures. Mission supervisor. Responsible for training of the operating crew for Mission 2. Space
Space Biospheres Ventures.
1991 – 1993 Co-Captain, Biosphere 2 Crew September 26, 1991 to September 26, 1
Manager of Agriculture and Food Systems.
1987- 1991 Administrator, Architectural Division, Space Biospheres Ventures. Responsible for management and coordination of architectural division operations, financial administration and cost control for Biosphere 2, a three-acre materially closed ecological system containing rainforest, Savannah, marsh, marine, intensive agriculture and human habitat biomes.
1987-1991 Candidate for Biospherian Resident Research Team and participant in the Biospherian Training Program, including biome collection expeditions and participation in a marine expedition.
1990 Research operator for five-day completely closed system experiment in the Biosphere 2 Test Module.
1984-1987 Director of Research Applications, Tropic Ventures/Institute of Ecotechnics, Las Casas Project, Puerto Rico, responsible for the establishment, development, and ongoing management of the research information department of a tropical ecological research center focussing on identification of commercially valuable tropical plant research center focussing on identification of commercially valuable tropical plant crops and development of integrated systems incorporating economic production in tropical rainforests; species selection and collection for Biosphere 2.
1983- 1984 Administrative Officer, Institute of Ecotechnics, London. Responsible for coordination of communications and international programs.
1982- 1983 Manager, Scarborough House Hostel, London, responsible for staff management, documentation, program development and implementation for a community based residential project to reintegrate mentally handicapped adults into the local community.
1979- 1981 Development Officer, Service Civil International, Bihar, India, responsible for documentation and implementation of drought relief and agricultural systems program for a desertified tropical area, including orchard and garden plantations, nutrition, irrigation, drinking water systems and sanitation programs, seed banks and crop storage facilities.
1973 – 1974 Field Assistant, S.O.S. Children’s Village, Kenya, responsible to assist manager in record keeping and administration of village facilities for 150 orphaned children, organized recreational programs and assisted in employment and training of house mothers.
Nelson, M., W.F. Dempster, A. Alling, J.P. Allen, R. Rasmussen, S. Silverstone, and M. Van Thillo. 2002. Initial Experimental Results from the Laboratory Biosphere Closed Ecological System Facility. COSPAR. (in review)
Nelson, M., J.P.Allen, A. Alling, W.F. Dempster, and S. Silverstone. 2002. Earth Applications of Closed Ecological Systems: Relevance to the Development of Sustainability in our Global Biosphere. COSPAR. (in review)
Dempster, W.F., M. Van Thillo, A. Alling, J.P. Allen, S. Silverstone, M. Nelson. 2002. Technical Review of the Laboratory Biosphere Closed Ecological System Facility. COSPAR (in review).
Silverstone, S., M. Nelson, A. Alling, J. Allen. 2001. Development and Research Program for Testing a Soil Based Bioregenerative Agriculture System to Feed a Four Person Crea at a Mars Base. COSPAR (in press).
Salisbury, F.B., W.F. Dempster, J.P.Allen, A. Alling, D. Bubenheim, M. Nelson, and S. Silverstone. 2002. Light, Plants, and Power for Life Support on Mars. Life Support and Biosphere Science. Vol. 8, pp. 161-172.
Silverstone.S., R.R. Harwood, E. Franco-Vizcaino, J. Allen and M. Nelson, 1999. Soil in the agricultural area of Biosphere 2 (1991-1993). Ecological Engineering 13 (1999) 179-188.
Silverstone, S., 1997. Food production and nutrition for the crew during the first 2-year closure of Biosphere 2. Life Support and Biosphere Science. Vol.4 pp.167-178.
Silverstone, S., M. Nelson . Food Production and Nutrition in Biosphere 2: Results from the First Mission September 1991 to September 1993. In Advances in Space Research Vol. 18, No. 4/5,pp (4/5)49-(4/5)61.
Alling, A., M. Nelson, and S. Silverstone. 1993 Life Under Glass: The Inside Story of Biosphere 2. Synergetic Press, Santa Fe, NM.
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Nelson M., S. Silverstone, and J. Poynter. 1993. Biosphere 2 Agriculture: Test Bed for Intensive, Sustainable, Non-polluting Farming Systems. Outlook on Agriculture 22(3): 167-174.
Silverstone, S. 1993. Eating in: From the Field to the Kitchen in Biosphere 2. Synergetic Press, Santa Fe, NM.
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W. Dempster, N. Alvarez-Romo, G. Hudman, T. MacCallum, S. Silverstone, M. Nelson, A. Alling. From
Theory to Practice: The Initial Two-Year Closure of Biosphere 2. In P.J. Boston, ed.
Proceedings of the Case For Mars V Conference, AAS Science and Technology Series (in review).