Seven friends Haroon, Imran, Jason, Kirti, Lisa, Mohan, and Niti having different heights, are standing in descending order of their heights. The tallest person stands at the front and the shortest person stands at the last of the column. Haroon stands immediately behind Lisa, who stands immediately behind Kirti. There are exactly two people standing in between Mohan and Niti. Imran is standing in the second position from the front. Mohan is not the tallest. Who is standing at the front of the column?