The Gallery holds the most extensive collection of portraits in the world. Search over 215,000 works, 150,000 of which are illustrated from the 16th Century to the present day.

Advanced Collection search

Search the Collection

Sir (John) Ambrose Fleming

(1849-1945), Electrical engineer and university teacher

Sitter in 8 portraits
Physicist and electrical engineer. Born in Lancaster, Fleming studied at St John's College, Cambridge. Whilst Professor of Electrical Engineering at University College London (1885-1926), he invented the Thermionic Valve (1904), which became widely used in the rapidly developing world of television, radio and early computing. Fleming was also a pioneer in the application of electricity to heating and lighting on a large scale. He was knighted in 1929.

Tell us More

 Like voting
is closed

Thanks for Liking

Please Like other favourites!
If they inspire you please support our work.

Make a donation Close

List Thumbnail

Sir (John) Ambrose Fleming, by Walter Stoneman - NPG x165627

Sir (John) Ambrose Fleming

by Walter Stoneman
bromide print, 1923
NPG x165627

Sir (John) Ambrose Fleming, by Bassano Ltd - NPG x124487

Sir (John) Ambrose Fleming

by Bassano Ltd
whole-plate glass negative, 25 March 1929
NPG x124487

Sir (John) Ambrose Fleming, by Bassano Ltd - NPG x124488

Sir (John) Ambrose Fleming

by Bassano Ltd
whole-plate glass negative, 25 March 1929
NPG x124488

Sir (John) Ambrose Fleming, by Walter Benington, for  Elliott & Fry - NPG x91858

Sir (John) Ambrose Fleming

by Walter Benington, for Elliott & Fry
chlorobromide print, February 1932
NPG x91858

Sir (John) Ambrose Fleming, by Elliott & Fry - NPG x82135

Sir (John) Ambrose Fleming

by Elliott & Fry
half-plate negative, 1932
NPG x82135

Web image not currently available

Sir (John) Ambrose Fleming

by Walter Stoneman
negative, 1917
NPG x43379

Web image not currently available

Sir (John) Ambrose Fleming

by Walter Benington, for Elliott & Fry
bromide print, 19 February 1932
NPG x94117

Web image not currently available

Sir (John) Ambrose Fleming

by Walter Stoneman
half-plate glass copy negative, June 1950 (1923)
NPG x190842

Tell us more back to top

Can you tell us more about this person? Spotted an error, information that is missing (a sitter’s life dates, occupation or family relationships, or a date of portrait for example) or do you know anything that we don't know? If you have information to share please complete the form below.

If you require information from us, please use our Archive enquiry service. You can buy a print of most illustrated portraits. Select the portrait of interest to you, then look out for a Buy a Print button. Prices start at £6 for unframed prints, £25 for framed prints. If you wish to license an image, please use our Rights and Images service.

Please note that we cannot provide valuations.

We digitise over 8,000 portraits a year and we cannot guarantee being able to digitise images that are not already scheduled.

What can you tell us?close

There are occasions when we are unsure of the identity of a sitter or artist, their life dates, occupation or have not recorded their family relationships. Sometimes we have not recorded the date of a portrait. Do you have specialist knowledge or a particular interest about any aspect of the portrait or sitter or artist that you can share with us? We would welcome any information that adds to and enhances our information and understanding about a particular portrait, sitter or artist.


How do you know this? Please could you let us know your source of information.

* Permission to publish (Privacy information)
Privacy Informationclose

The National Portrait Gallery will NOT use your information to contact you or store for any other purpose than to investigate or display your contribution. By ticking permission to publish you are indicating your agreement for your contribution to be shown on this collection item page. Please note your email address will not be displayed on the page nor will it be used for any marketing material or promotion of any kind.

Please ensure your comments are relevant and appropriate. Your contributions must be polite and with no intention of causing trouble. All contributions are moderated.

Your Emailclose

Contributions are moderated. We'll need your email address so that we can follow up on the information provided and contact you to let you know when your contribution has been published.


Scientific techniques

Watch our playlist exploring scientific techniques used by the Gallery to unlock the secrets behind our Tudor portraits.

Watch now

Subjects and themes

Search the collection by themes - from pets to weddings!

Discover the Collection

Black History Month

Take a tour exploring our Collection created by Alayo Akinkugbe for Black History Month in 2020.

Take the tour

A Picture of Health

Learn about pioneers in medicine, health and social reform from 1840 to 1920.

Explore the timeline