The seal script stamp appears the same characters as the calligraphy signature... It could be 幾楠 (Jī Nán) the second character on the calligraphy and the first character on the script looks like 楠 (Nán) but I'm guessing the seal script second character and the calligraphy are 幾(Jī). If it is Jī that is interesting because rooster in Chinese is 公鸡 (gōng jī) which is the same sound as the character 幾(Jī).