| Authorised form of name | Marcet; Alexander John Gaspard (1770 - 1822) | 
| Dates | 1770 - 1822 | 
| Place of birth | Geneva, Switzerland | 
| Date of birth | 1770 | 
| Place of death | Great Coram Street, London | 
| Date of death | 19 October 1822 | 
| Occupation | Physician | 
| Activity | Education: Geneva. MD (1794, Edinburgh)
 Career:
 Physician, Guy's Hospital, London (1804-1809) when he resigned to devote himself to science upon inheriting his father's fortune; returned to Geneva and was a member of the Representative Council and Honorary Professor of Chemistry; returned to England (1821); one of the original promoters of the Medico-Chirurgical Society (later the Royal Society of Medicine)
 Memberships:
 LCP (1799)
 
 | 
| Membership category | Fellow | 
| Date of election | 02/06/1808 | 
| Relationships | Married: (1799) Jane, economist and saloniniere, daughter of Anthony Francis Haldimand, Swiss merchant in London Children: Francis Marcet (FRS 1836); Louise-Françoise Marcet (1807-1834); Sophie Marcet (1809-1877)
 Other relatives: grandson William Marcet (FRS 1857)
 | 
| Source | Sources: Bulloch's Roll; DNB
 References:
 Paul A Tunbridge, 'Faraday's Genevese Friends' in NR 1972-3 vol 27 pp 263-298
 J A Chaldecott, 'Contributions of Fellows of the Royal Society to the Fabrication of Platinum Vessels: Some Unpublished Manuscripts' in NR 1967 vol 22 pp 155-172, plate
 N G Coley, 'George Pearson MD, FRS (1751-1828):  'The greatest chemist in England'? in NR 2003 vol 57 pp
 161-175
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| Virtual International Authority File | 4651805 | 
| Code | NA7022 | 
| RefNo | Title | Date | 
| IM/002973 | Marcet, Alexander John Gaspard | nd | 
| PT/5/6 | Letter from Alex [Alexander] Marcet to [William Hyde Wollaston] | 8 January 1811 | 
| EC/1808/05 | Marcet, Alexander John Gaspard: certificate of election to the Royal Society |  | 
| PT/5/5 | Paper, 'On the nonexistence of sugar in the blood of persons labouring under diabetes mellitus' in a letter to Alex [Alexander] Marcet from Wm [William] H [Hyde] Wollaston | 1 January 1811 | 
| PT/7/23 | Paper, 'Experiments on the alcohol of sulphur, or sulphuret of carbon' by J [Jons Jacob] Berzelius and Alex [Alexander] Marcet | [1813] | 
| PT/7/23/2 | Plate, two figures showing a method for distilling sulphuret by unknown artist | [1813] | 
| PT/7/23/1 | Manuscript, 'Experiments on the alcohol of sulphur, or sulphuret of carbon' by J [Jons Jacob] Berzelius and Alex [Alexander] Marcet | [1813] | 
| PT/7/29/2 | Plate, diagram of experiment using thermometer, air pump, and sulphuret of carbon by unknown artist | [1813] | 
| PT/1/20 | Paper, 'An analysis of the waters of the Dead Sea and the River Jordan' by Alexander [John Gaspard] Marcet | [1807] | 
| PT/7/29/1 | Manuscript, 'Experiments on the production of cold by the evaporation of the sulphuret of carbon' by Alexander Marcet | [1813] | 
| PT/13/14 | Paper, 'On the specific gravity, and temperature of sea waters, in different parts of the ocean, and in particular seas; with some account of their saline contents' by Alex [Alexander] Marcet | [1819] | 
| PT/13/4 | Paper, 'Observations on the decomposition of starch by the action of air and water at common temperatures' by [Nicolas] Theodore de Saussure | 7 October 1818 | 
| PT/73/7/11 | Drawing, machine for sampling seawater at depth by [LFM] | [1819] | 
| PT/13/3 | Paper, 'Observations sur la décomposition de l'amidon à la température atmosphérique par l'action de l'air et de l'eau' by [Nicolas] Theodore de Saussure | 7 October 1818 | 
| PT/7/29 | Paper, 'Experiments on the production of cold by the evaporation of the sulphuret of carbon' by Alexander Marcet | [1813] | 
| PT/73/7/12 | Drawings, improved machine for sampling seawater at depth by [TP and LFM] | [1819] |