H.A. Der-Hovagimian
 H.A. Der-Hovagimian (sometimes spelled Ter-Hovakimyan (Traditional Armenian: Յարութիւն Տեր-Յովակիմեան Eastern Armenian: Հարություն Տեր-Հովակիմյան)) born in Toronto Ontario is a Canadian-Armenian music composer songwriter and producer.He signed his first recording contract with the newly found Hi-Bias Records imprint at the age of 17. For the following 15 years he was mainly credited under the adopted pseudonym Mark Ryan.For years his main focus was his Temperance project.