What is your Kozma Number? An academic career in the light of co-author networks

When celebrating an acknowledged education researcher’s birthday, we usually make a lengthy enumeration of their research projects, volumes, positions, prizes and other instances of their professional achievement. Birthdays actually serve as occasions for collecting them, just as we compiled the bibliography of Tamás Kozma’s works for his 70th birthday (Nagy-Baló, Varga Kovács & Kozmáné, 2009). Now, however, we would like to celebrate his 75th birthday in a non-traditional way. As he is a very prolific author, his collected bibliography is likely to be published again in electronic or printed form. It would be redundant to summarize his life story and his extensive work experience after he published his autobiography titled Erdei séta (A Walk in the Forest), which gives a picture of the events of his life against a colourful cultural background, making it a valuable piece of reading also as a source of the history and sociology of social science (Kozma, 2011). Trying to avoid cliches, we are going to greet him in a special way.