He spent most of his career as a practicing physician at Touro Infirmary of New Orleans.
Touro University California | Manchester Royal Infirmary | Leicester Royal Infirmary | Glasgow Royal Infirmary | Touro College | Bradford Royal Infirmary | Aberdeen Royal Infirmary | Western Infirmary | St. James Infirmary Blues | Royal Victoria Infirmary | Royal Infirmary of Edinburgh | Radcliffe Infirmary | Leeds General Infirmary | Judah Touro | Hull Royal Infirmary | Bristol Royal Infirmary | Touro Synagogue | Touro Infirmary | Touro Cemetery | St. James Infirmary Clinic | St. James Infirmary | Southport General Infirmary | Perth Royal Infirmary | Edinburgh's Royal Infirmary | Dumfries and Galloway Royal Infirmary | Doncaster Royal Infirmary |
Regarding Leucht's Jewish communal work, his great grandson, Bill Rosen, in a nostalgic letter detailing his own departure from New Orleans after Hurricane Katrina, wrote that during his great-grandfather's years in New Orleans, Leucht "started or helped develop every major Jewish institution of his time - he built Touro Synagogue, laid the corner stone of Touro Infirmary and worked ten years to develop the Newman School," institutions that continue to service New Orleans.