I can name that physicist in 5 notes.

[tribdog]

Full Size Picture
Making up this picture of Albert Einstein are the pictures of 21 famous physicists. How many can you name?
In alphabetical order the last names of these physicists contain this many letters:8,5,4,13,5,5,5,7,5,7,7,8(4-4),10,6,11,5,6,10,11,5,5
Hint: Some are mathematicians and some are physicists and some are greater than others, but all are well known. Or should be.

Spoiler

the first letter of each last name is:A,B,B,C,C,D,E,F,F,F,G,G,H,N,O,P,P,R,S,T,V

 

[tribdog]

Spoiler

1.A-------
2. B----
3. B---
4. C------------
5. C----
6. D----
7. E----
8. F------
9. F----
10. F------
11. G------
12. G--- - M---
13. H---------
14. N-----
15. O----------
16. P----
17. P-----
18. R---------
19. S----------
20. T----
21. V----

 

[Caracrist]

20- Tesla

 

[Jonathan Scott]

Nice, but I think the list showing the first letter and the number of letters made it too easy. I had to confirm some guesses using Google for images of that person.

Here's what I got:

Spoiler

Avogadro
Bethe
Bohr
Chandrasekhar
Curie
Dirac
Euler
Faraday
Fermi
Feynman
Galileo
Gell-Mann
Heisenberg
Newton
Oppenheimer
Pauli
Planck
Rutherford
Schrödinger
Tesla
Volta

 

[tribdog]

I wouldn't have put the list with the letters, but no one was attempting without it.