In terms of their contribution to Econometrics which is correct chronological order :
1
L.R. Klein. H. Theil. A.L. Nagar. T. Haavelmo
2
A.L. Nagar. T. Haavelmo. L.R. Hlein. H. Theil
3
T. Haavelmo. L.R. Klein. H. Theil. A.L. Nagar
4
H. Theil. L.R. Klein. AL. Nagar. T. Haavelmo