Frequent collaborators:

Diamond level (21-30 papers): 

Bela Bollobas (29) 

Platinum level (15-20 papers): 

Rob Morris (19), 

Wojtek Samotij (15) 

Gold level (10-14 papers):
Felix Christian Clemen (14), 

Alexandr Kostochka (12), Bernard Lidicky (12),  Hong Liu (12), 

Andrew Treglown (11), Adam Zsolt Wagner (11),
Andras Pluhar (10), Maryam Sharifzadeh (10), 

Silver level (5-9 papers): 

Gelasio Salazar (9), 

Lina Li (8),  

Ping Hu (7), Misha Lavrov (7), 

Noga Alon (6), Xujun Liu (6), Dhruv Mubayi (6), John Lenz (6), 

Igor Araujo (5), Bela Csaba (5), Ryan Martin (5), 

Bronze level (2-4 papers):  

Jane Butterfield (4),  Emily Heath (4), Robert Krueger (4), Will Linz (4), Haoran Luo (4), Leticia Mattos (4), Theo Molla (4), Bhargav Narayanan (4), Miklos Simonovits (4), David Weinreich (4),   Cory Palmer (4),

Michelle Delcourt (3), Ramon Garcia (3), Peter Keevash (3),  Sarka Petrickova (3), Florian Pfender (3), Jozef Skokan (3), Benny Sudakov (3), Jan Volec (3),

Maria Axenovich (2), Ce Chen (2), Janos A. Csirik (2) , Shagnik Das (2), Adrian Dumitrescu (2), Jesus Leanos (2), Choongbum Lee (2), Richard Mycroft (2), Balázs Patkós (2), Gabor Pete (2), Boris Pittel (2), Noah Prince (2), Cliff Smyth (2), Tuan Tran (2).