There has been tremendous progress in the last few days. My male no longer is freaked out, in fact he is amazingly relaxed around Nala. My female, Twinkle, has also made a lot of progress. I appreciate your suggestions. In my case, I think the break through was when I brought out the little mouse on a wand toy. I was playing with Nala when Pumpkin (the male) came up and started playing. I kept the cats on either side of me and shared the toy equally with both of them. The next day Twinkle watched while this was going on. I then brought out the toy you see in the picture, it has a string that it whips out and around. You turn it on, set it down and it goes by itself for about 15 minutes. You may notice in the picture Nala and Pumpkin are actively playing with it and Twinkle is closely watching, later she started playing. Things are not perfect but they are much better. Thanks for the advice.