I own a book on birth control written by Rabbi David M Feldman. I was very impressed on how much bikius he has and erudition on the subject. I really cannot find any info on him,and wanted to know of he was an Orthodox or Conservitive Rabbi. From his writing I got the impression that he was orthodox,but I am not sure.
This article says Rabbi Dr. David M. Feldman was a leader of the Conservative movement's traditional faction.
The JCT maintained itself as an ultra-traditional synagogue under both Rabbi Washer's leadership and that of his successor, Rabbi Dr. David M. Feldman. Though ordained by the Jewish Theological Seminary and a leader of the Conservative movement's traditional faction, Rabbi Feldman also holds an Orthodox ordination. As Teaneck developed into a growing Orthodox community and children moving elsewhere the JCT's once robust membership of nearly 1,500 families began to dwindle. Its model of conservative Judaism no longer had an audience.
This article states that he received his rabbinical ordination (semicha) from Yeshiva University. Most who do this are Orthodox, but it is not a 100% guarantee. The article does not offer any details either way.